Red blood cells are the most common type of blood cell and the vertebrate body's principal means of delivering oxygen from the lungs or gills to body tissues via the blood. Red Teams or Red Cells are U.S. government parlance for teams or units designed to test the effectiveness of U.S. tactics or personnel. ... A blood cell is any cell of any type normally found in blood. ... This article does not cite any references or sources. ... For other uses, see Body (disambiguation). ... General Name, symbol, number oxygen, O, 8 Chemical series nonmetals, chalcogens Group, period, block 16, 2, p Appearance colorless (gas) very pale blue (liquid) Standard atomic weight 15. ... Human respiratory system The lungs flank the heart and great vessels in the chest cavity. ... For other uses, see Gill (disambiguation). ... Human blood smear: a - erythrocytes; b - neutrophil; c - eosinophil; d - lymphocyte. ...

Human red blood cells

Red blood cells are also known as RBCs', haematids or erythrocytes (from Greek erythros for "red" and kytos for "hollow", with cyte nowadays translated as "cell"). "RBCs" should in fact be referred to as "corpuscles" rather than "cells". Indeed, a 'cell' contains a nuclear element, mature RBCs do not contain a nucleus in mammals. A micrograph of red blood cells, taken from the site http://www. ...

A schistocyte is a red blood cell undergoing fragmentation, or a fragmented part of a red blood cell.

Vertebrate erythrocytes

From left to right: erythrocyte, thrombocyte, leukocyte.

Erythrocytes consist mainly of hemoglobin, a complex molecule containing heme groups whose iron atoms temporarily link to oxygen molecules in the lungs or gills and release them throughout the body. Oxygen can easily diffuse through the red blood cell's cell membrane. Hemoglobin also carries some of the waste product carbon dioxide back from the tissues. (In humans, less than 2% of the total oxygen, and most of the carbon dioxide, is held in solution in the blood plasma). A related compound, myoglobin, acts to store oxygen in muscle cells. Image File history File links Red_White_Blood_cells. ... Image File history File links Red_White_Blood_cells. ... Human red blood cells Red blood cells are the most common type of blood cell and are the vertebrate bodys principal means of delivering oxygen to body tissues via the blood. ... A 250 ml bag of newly collected platelets. ... White Blood Cells is also the name of a White Stripes album. ... Structure of hemoglobin. ... 3D (left and center) and 2D (right) representations of the terpenoid molecule atisane. ... Structure of Heme b A heme or haem is a prosthetic group that consists of an iron atom contained in the center of a large heterocyclic organic ring called a porphyrin. ... For other uses, see Iron (disambiguation). ... diffusion (disambiguation). ... Look up cell membrane in Wiktionary, the free dictionary. ... Carbon dioxide is a chemical compound composed of two oxygen atoms covalently bonded to a single carbon atom. ... Blood plasma is the liquid component of blood, in which the blood cells are suspended. ... An X-ray diffraction image for the protein myoglobin. ... A top-down view of skeletal muscle Muscle (from Latin musculus little mouse [1]) is contractile tissue of the body and is derived from the mesodermal layer of embryonic germ cells. ...

The color of erythrocytes is due to the heme group of hemoglobin. The blood plasma alone is straw-colored, but the red blood cells change color depending on the state of the hemoglobin: when combined with oxygen the resulting oxyhemoglobin is scarlet, and when oxygen has been released the resulting deoxyhemoglobin is darker, appearing bluish through the vessel wall and skin. Pulse oximetry takes advantage of this color change to directly measure the arterial blood oxygen saturation using colorimetric Blood plasma is the liquid component of blood, in which the blood cells are suspended. ... Pulse oximetry is a non-invasive method which allows health care providers to monitor the oxygenation of a patients blood. ... Section of an artery For other uses, see Artery (disambiguation). ... Oxygen saturation is a relative measure of the amount of oxygen that is dissolved or carried in a given medium. ... A colorimeter is device used to measure the absorbance of a specific solution. ...

The sequestration of oxygen-carrying proteins inside cells (rather than having them dissolved in body fluid) was an important step in the evolution of vertebrates; it allows for less viscous blood and higher concentrations of oxygen. This article is about evolution in biology. ... Typical classes Petromyzontidae (lampreys) Placodermi - extinct Chondrichthyes (cartilaginous fish) Acanthodii - extinct Actinopterygii (ray-finned fish) Actinistia (coelacanths) Dipnoi (lungfish) Amphibia (amphibians) Reptilia (reptiles) Aves (birds) Mammalia (mammals) Vertebrata is a subphylum of chordates, specifically, those with backbones or spinal columns. ... For other uses, see Viscosity (disambiguation). ...

In 2007 it was reported that erythrocytes also play a part in the body's immune response: when lysed by pathogens such as bacteria, their hemoglobin releases free radicals that break down the pathogen's cell wall and membrane, killing it.^[1][2] A request has been made on Wikipedia for this article to be deleted in accordance with the deletion policy. ... This article is about the biological definition of the word Lysis. ... In chemistry free radicals are uncharged atomic or molecular species with unpaired electrons or an otherwise open shell configuration. ...

Mammalian erythrocytes

Erythrocytes in mammals are anucleate when mature, meaning that they lack a cell nucleus and thus have no DNA. In comparison, the erythrocytes of nearly all other vertebrates have nuclei; the only known exception being salamanders of the Batrachoseps genus.^[3] Mammalian erythrocytes also lose their other organelles including their mitochondria and produce energy by fermentation, via glycolysis of glucose followed by lactic acid production. Furthermore, red cells do not have an insulin receptor and thus glucose uptake is not regulated by insulin. As a result of the lack of nucleus and organelles, the cells cannot produce new structural or repair proteins or enzymes and their lifespan is limited. Subclasses & Infraclasses Subclass †Allotheria* Subclass Prototheria Subclass Theria Infraclass †Trituberculata Infraclass Metatheria Infraclass Eutheria Mammals (class Mammalia) are warm-blooded, vertebrate animals characterized by the presence of sweat glands, including those that produce milk, and by the presence of: hair, three middle ear bones used in hearing, and a neocortex... HeLa cells stained for DNA with the Blue Hoechst dye. ... The structure of part of a DNA double helix Deoxyribonucleic acid, or DNA, is a nucleic acid molecule that contains the genetic instructions used in the development and functioning of all known living organisms. ... This article does not cite any references or sources. ... For other uses, see Salamander (disambiguation). ... Species 19 species, see text Slender Salamanders is the name often given to Plethodontid (lungless) salamanders of the genus Batrachoseps. ... Schematic of typical animal cell, showing subcellular components. ... Electron micrograph of a mitochondrion showing its mitochondrial matrix and membranes In cell biology, a mitochondrion (plural mitochondria) is a membrane-enclosed organelle that is found in most eukaryotic cells. ... It has been suggested that this article or section be merged with Fermentation (food). ... The word glycolysis is derived from Greek γλυκύς (sweet) and λύσις (rupture). ... Glucose (Glc), a monosaccharide (or simple sugar), is an important carbohydrate in biology. ... For the production of milk by mammals, see Lactation. ... In molecular biology, the insulin receptor is a transmembrane receptor that is activated by insulin. ... Insulin (from Latin insula, island, as it is produced in the Islets of Langerhans in the pancreas) is an anabolic polypeptide hormone that regulates carbohydrate metabolism. ... Ribbon diagram of the enzyme TIM, surrounded by the space-filling model of the protein. ...

Mammalian erythrocytes are biconcave disks: flattened and depressed in the center, with a dumbbell-shaped cross section. This shape (as well as the loss of organelles and nucleus) optimizes the cell for the exchange of oxygen with its surroundings. The cells are flexible so as to fit through tiny capillaries, where they release their oxygen load. Erythrocytes are circular, except in the camel family Camelidae, where they are oval. A concave set (it has a dent). ... This article does not cite any references or sources. ... For other uses, see Camel (disambiguation). ... Species  Lama glama  Lama pacos  Lama guanicoe  Vicugna vicugna  Camelus dromedarius  Camelus bactrianus The four llamas and two camels are camelids: members of the biological family Camelidae, the only family in the suborder Tylopoda. ...

In large blood vessels, red blood cells sometimes occur as a stack, flat side next to flat side. This is known as rouleaux formation, and it occurs more often if the levels of certain serum proteins are elevated, as for instance during inflammation. An abscess on the skin, showing the redness and swelling characteristic of inflammation. ...

The spleen acts as a reservoir of red blood cells, but this effect is somewhat limited in humans. In some other mammals such as dogs and horses, the spleen sequesters large numbers of red blood cells which are dumped into the blood during times of exertion stress, yielding a higher oxygen transport capacity. The spleen is an organ located in the abdomen, where it functions in the destruction of old red blood cells and holding a reservoir of blood. ... Trinomial name Canis lupus familiaris The dog (Canis lupus familiaris) is a domestic subspecies of the wolf, a mammal of the Canidae family of the order Carnivora. ... Binomial name Equus caballus Linnaeus, 1758 The horse (Equus caballus, sometimes seen as a subspecies of the Wild Horse, Equus ferus caballus) is a large odd-toed ungulate mammal, one of ten modern species of the genus Equus. ...

Erythrocytes: (a) seen from surface; (b) in profile, forming rouleaux; (c) rendered spherical by water; (d) rendered crenate by salt. (c) and (d) do not normally occur in the body.

Image File history File links Gray453. ... Image File history File links Gray453. ...

Human erythrocytes

The diameter of a typical human erythrocyte disk is 6–8 µm, much smaller than most other human cells. A typical erythrocyte contains about 270 million hemoglobin molecules, with each carrying four heme groups. To help compare different orders of magnitude this page lists lengths between 10-6 and 10-5 m (1 µm and 10 µm). ... There are about 210 distinct human cell types. ...

Adult humans have roughly 2–3 × 10¹³ red blood cells at any given time (women have about 4 to 5 million erythrocytes per microliter (cubic millimeter) of blood and men about 5 to 6 million; people living at high altitudes with low oxygen tension will have more). Red blood cells are thus much more common than the other blood particles: There are about 4,000–11,000 white blood cells and about 150,000–400,000 platelets in each microliter of human blood. To help compare orders of magnitude this page lists dimensionless numbers between 1012 and 1015: See also Orders of magnitude (numbers) Categories: Stub | Orders of magnitude (numbers) ... The liter (spelled liter in American English and litre in Commonwealth English) is a unit of volume. ... White Blood Cells is also the name of a White Stripes album. ... A 250 ml bag of newly collected platelets. ...

The red blood cells of an average adult human male store collectively about 2.5 grams of iron, representing about 65% of the total iron contained in the body.^[4][5] (See Human iron metabolism.) For other uses, see Iron (disambiguation). ... Human beings use 20 mg of iron each day for the production of new red blood cells, much of which is recycled from old red blood cells. ...

Life cycle

The process by which red blood cells are produced is called erythropoiesis. Erythrocytes are continuously being produced in the red bone marrow of large bones, at a rate of about 2 million per second. (In the embryo, the liver is the main site of red blood cell production.) The production can be stimulated by the hormone erythropoietin (EPO), synthesised by the kidney; which is used for doping in sports. Just before and after leaving the bone marrow, they are known as reticulocytes which comprise about 1% of circulating red blood cells. Erythropoiesis is the process by which red blood cells (erythrocytes) are produced. ... This article does not cite any references or sources. ... For other uses, see Embryo (disambiguation). ... For the bird, see Liver bird. ... Norepinephrine A hormone (from Greek όρμή - to set in motion) is a chemical messenger from one cell (or group of cells) to another. ... Erythropoietin (IPA pronunciation: , alternative pronunciations: ) or EPO is a glycoprotein hormone that is a cytokine for erythrocyte (red blood cell) precursors in the bone marrow. ... In sports, doping refers to the use of performance-enhancing drugs, particularly those that are forbidden by the organizations that regulate competitions. ... Reticulocyte Erythrocyte Reticulocytes are immature red blood cells, typically comprising about 1% of the red cells in the human body. ...

Erythrocytes develop from committed stem cells through reticulocytes to mature erythrocytes in about 7 days and live a total of about 120 days.

The aging erythrocyte undergoes changes in its plasma membrane, making it susceptible to recognition by phagocytes and subsequent phagocytosis in the spleen, liver and bone marrow. Much of the important breakdown products are recirculated in the body. The heme constituent of hemoglobin are broken down into Fe³⁺ and biliverdin. The biliverdin is reduced to bilirubin, which is released into the plasma and recirculated to the liver bound to albumin. The iron is released into the plasma to be recirculated by a carrier protein called transferrin. Almost all erythrocytes are removed in this manner from the circulation before they are old enough to hemolyze. Hemolyzed hemoglobin is bound to a protein in plasma called haptoglobin which is not excreted by the kidney. Drawing of a cell membrane A component of every biological cell, the cell membrane (or plasma membrane) is a thin and structured bilayer of phospholipid and protein molecules that envelopes the cell. ... A phagocyte is a cell that ingests and destroys foreign matter such as microorganisms or debris via a process known as phagocytosis. ... Steps of a macrophage ingesting a pathogen: a. ... The spleen is an organ located in the abdomen, where it functions in the destruction of old red blood cells and holding a reservoir of blood. ... Biliverdin is a green pigment formed as a byproduct of hemoglobin breakdown. ... Bilirubin is a yellow breakdown product of normal heme catabolism. ... Albumin can refer to ovalbumin, the principal protein in egg white albumins, a group of proteins including serum albumin and together constituting roughly 60% of the protein in blood plasma. ... Transferrin is a plasma protein for iron ion delivery. ... {{otheruses4|1=medical hemoglobin]] into the surrounding fluid (plasma, in vivo). ... Haptoglobin (abbreviated as Hp) is a protein in the blood plasma that binds free hemoglobin released from erythrocytes with high affinity and thereby inhibits its oxidative activity. ...

Surface proteins

There are two main types of proteins on the surface: A representation of the 3D structure of myoglobin, showing coloured alpha helices. ...

• Band 3
• Glycophorins such as glycophorin C

The blood types of humans are due to variations in surface glycoproteins of erythrocytes. Anion Exchanger 1 (AE1) or Band 3 is a phylogenetically preserved transport protein responsible for catalysing the electroneutral exchange of chloride (Cl-) for bicarbonate (HCO3-) across a plasma membrane. ... A Glycophorin is a sialoglycoprotein of the membrane of a red blood cell. ... Glycophorin C (GYPC; CD236/CD236R; glycoprotein beta; glycoconnectin; PAS-2) is an integral membrane protein of the erythrocyte and acts as the receptor for the Plasmodium falciparum protein PfEBP-2 (erythrocyte binding protein 2; baebl; EBA-140). ... This article is about human blood types (or blood groups). ... A glycoprotein is a macromolecule composed of a protein and a carbohydrate (an oligosaccharide). ...

Separation and blood doping

Red blood cells can be separated from blood plasma by centrifugation. During plasma donation, the red blood cells are pumped back into the body right away, and the plasma is collected. Some athletes have tried to improve their performance by blood doping: first about 1 litre of their blood is extracted, then the red blood cells are isolated, frozen and stored, to be reinjected shortly before the competition. (Red blood cells can be conserved for 5 weeks at −79 °C.) This practice is hard to detect but may endanger the human cardiovascular system which is not equipped to deal with blood of the resulting higher viscosity. Blood plasma is the liquid component of blood, in which the blood cells are suspended. ... Centrifugation is a process that involves the use of the centrifugal force for the separation of mixtures. ... “Give blood” redirects here. ... Blood doping is the practice of illicitly boosting the number of red blood cells (RBCs) in the circulation in order to enhance athletic performance. ... The circulatory system or cardiovascular system is the organ system which circulates blood around the body of most animals. ... For other uses, see Viscosity (disambiguation). ...

Diseases and diagnostic tools

Affected by Sickle-cell disease, red blood cells alter shape and threaten to damage internal organs.

Blood diseases involving the red blood cells include: Micrograph of sickled red blood cells, taken from the NIH (US government agency) site at http://www. ... Sickle-cell disease is a group of genetic disorders caused by sickle hemoglobin (Hgb S or Hb S). ... Blood diseases affect the production of blood and its components, such as blood cells, hemoglobin, blood proteins, the mechanism of coagulation, etc. ...

• Anemias (or anaemias) are diseases characterized by low oxygen transport capacity of the blood, because of low red cell count or some abnormality of the red blood cells or the hemoglobin.
  • Iron deficiency anemia is the most common anemia; it occurs when the dietary intake or absorption of iron is insufficient, and hemoglobin, which contains iron, cannot be formed
  • Sickle-cell disease is a genetic disease that results in abnormal hemoglobin molecules. When these release their oxygen load in the tissues, they become insoluble, leading to mis-shaped red blood cells. These sickle shaped red cells are rigid and cause blood vessel blockage, pain, strokes, and other tissue damage.
  • Thalassemia is a genetic disease that results in the production of an abnormal ratio of hemoglobin subunits.
  • Spherocytosis is a genetic disease that causes a defect in the red blood cell's cytoskeleton, causing the red blood cells to be small, sphere-shaped, and fragile instead of donut-shaped and flexible.
  • Pernicious anemia is an autoimmune disease wherein the body lacks intrinsic factor, required to absorb vitamin B12 from food. Vitamin B12 is needed for the production of hemoglobin.
  • Aplastic anemia is caused by the inability of the bone marrow to produce blood cells.
  • Pure red cell aplasia is caused by the inability of the bone marrow to produce only red blood cells.
  • Hemolysis is the general term for excessive breakdown of red blood cells. It can have several causes.
• The malaria parasite spends part of its life-cycle in red blood cells, feeds on their hemoglobin and then breaks them apart, causing fever. Both sickle-cell disease and thalassemia are more common in malaria areas, because these mutations convey some protection against the parasite.
• Polycythemias (or erythrocytoses) are diseases characterized by a surplus of red blood cells. The increased viscosity of the blood can cause a number of symptoms.
  • In polycythemia vera the increased number of red blood cells results from an abnormality in the bone marrow.
• Several microangiopathic diseases, including disseminated intravascular coagulation and thrombotic microangiopathies, present with pathognomonic (diagnostic) RBC fragments called schistocytes. These pathologies generate fibrin strands that sever RBCs as they try to move past a thrombus.

Several blood tests involve red blood cells, including the RBC count (the number of red blood cells per volume of blood) and the hematocrit (percentage of blood volume occupied by red blood cells). The blood type needs to be determined to prepare for a blood transfusion or an organ transplantation. This article discusses the medical condition. ... Iron deficiency anemia is the most common type of anemia, and the most common cause of microcytic anemia. ... For other uses, see Iron (disambiguation). ... Sickle-cell disease is a group of genetic disorders caused by sickle hemoglobin (Hgb S or Hb S). ... Thalassemia (British spelling, thalassaemia) is an inherited autosomal recessive blood disease. ... Spherocytosis is an auto-hemolytic anemia (a disease of the blood) characterized by the production of red blood cells (RBCs), or erythrocytes, that are sphere-shaped, rather than donut-shaped. ... The eukaryotic cytoskeleton. ... Pernicious anemia (also known as Biermers anaemia or Addisons anaemia or Addison-Biermer anaemia) is a form of megaloblastic anaemia due to vitamin B12 deficiency dependent on impaired absorption of vitamin B12 in the setting of atrophic gastritis, and more specifically of loss of gastric parietal cells. ... Autoimmune diseases arise from an overactive immune response of the body against substances and tissues normally present in the body. ... Intrinsic factor is a glycoprotein produced by the parietal cells of the stomach. ... Cobalamin or vitamin B12 is a chemical compound that is also known as cyanocobalamine. ... Aplastic anemia is a condition where bone marrow does not produce sufficient new cells to replenish blood cells. ... This article does not cite any references or sources. ... Acquired pure red cell aplasia (or PRCA) refers to a type of anemia affecting the precursors to red blood cells but not to white blood cells. ... {{otheruses4|1=medical hemoglobin]] into the surrounding fluid (plasma, in vivo). ... Malaria is a vector-borne infectious disease caused by protozoan parasites. ... Sickle-cell disease is a group of genetic disorders caused by sickle hemoglobin (Hgb S or Hb S). ... Thalassemia (British spelling, thalassaemia) is an inherited autosomal recessive blood disease. ... Polycythemia is a condition in which there is a net increase in the total number of red blood cells in the body. ... Primary polycythemia, often called polycythemia vera (PCV), polycythemia rubra vera (PRV), or erythremia, occurs when excess red blood cells are produced as a result of an abnormality of the bone marrow. ... Microangiopathy is a disease process affecting small blood vessels. ... Disseminated intravascular coagulation (DIC) is a pathological process in the body where the blood starts to coagulate throughout the whole body. ... Thrombotic microangiopathies are a category of pathologies that result in thrombosis in capillaries and arterioles. ... Pathognomonic (often misspelled as pathognomic) is an adjective of Greek origin (παθογνωμονικό [σύμπτωμα]), often used in medicine, which means diagnostic for a particular disease. ... Fibrin is a protein involved in the clotting of blood. ... Blood clot diagram. ... Blood tests are laboratory tests done on blood to gain an appreciation of disease states and the function of organs. ... The hematocrit (Ht or HCT) and packed cell volume (PCV) are measures of the proportion of blood volume that is occupied by red blood cells. ... This article is about human blood types (or blood groups). ... Blood transfusion is the process of transferring blood or blood-based products from one person into the circulatory system of another. ... An organ transplant is the transplantation of an organ (or part of one) from one body to another, for the purpose of replacing the recipients damaged or failing organ with a working one from the donor. ...

History

In 1658, the Dutch biologist Jan Swammerdam was the first person to describe red blood cells. He had used an early microscope. Events January 13 - Edward Sexby, who had plotted against Oliver Cromwell, dies in Tower of London February 6 - Swedish troops of Charles X Gustav of Sweden cross The Great Belt (Storebælt) in Denmark over frozen sea May 1 - Publication of Hydriotaphia, Urn Burial and The Garden of Cyrus by... Jan Swammerdam (February 12, 1637 - February 17, 1680) was a Dutch biologist and microscopist. ... Robert Hookes microscope (1665) - an engineered device used to study living systems. ...

References

1. ^ Red blood cells do more than just carry oxygen. New findings by NUS team show they aggressively attack bacteria too., The Straits Times, 1 September 2007
2. ^ Jiang N, Tan NS, Ho B, Ding JL. Respiratory protein-generated reactive oxygen species as an antimicrobial strategy. Nature Immunology, 26 August 2007. PMID 17721536
3. ^ W. D. Cohen. The cytomorphic system of anucleate non-mammalian erythrocytes. Protoplasma, vol 113 no 1, February 1982
4. ^ Iron Metabolism, University of Virginia Pathology. Accessed 22 September 2007.
5. ^ Iron Transport and Cellular Uptake by Kenneth R. Bridges, Information Center for Sickle Cell and Thalassemic Disorders. Accessed 22 September 2007.

The Straits Times is an English-language broadsheet newspaper based in Singapore, currently owned by the Singapore Press Holdings (SPH). ...

External links

• Blood Groups and Red Cell Antigens by Laura Dean. Searchable and downloadable online textbook in the public domain.
• Database of vertebrate erythrocyte sizes.

Human blood smear: a - erythrocytes; b - neutrophil; c - eosinophil; d - lymphocyte. ... Blood plasma is the liquid component of blood, in which the blood cells are suspended. ... Sketch of bone marrow and its cells Pluripotential hemopoietic stem cells (PHSCs) are stem cells found in the bone marrow. ... A scanning electron microscope (SEM) image of a single human lymphocyte. ... “White Blood Cells” redirects here. ... T cells are a subset of lymphocytes that play a large role in the immune response. ... A cytotoxic T cell (also known as TC, CTL or killer T cell) belongs to a sub-group of T lymphocytes (a type of white blood cell) which are capable of inducing the death of infected somatic or tumor cells; they kill cells that are infected with viruses (or other... Antigen presentation stimulates T cells to become either cytotoxic CD8+ cells or helper CD4+ cells. ... Regulatory T cells (also known as suppressor T cells) are a specialized subpopulation of T cells that act to suppress activation of the immune system and thereby maintain immune system homeostasis and tolerance to self. ... γδ T cells represent a small subset of T cells that possess a distinct T cell receptor (TCR) on their surface. ... Natural killer T cells (NK T cells) are a type of lymphocyte, or white blood cell. ... B cells are lymphocytes that play a large role in the humoral immune response (as opposed to the cell-mediated immune response). ... Plasma cells (also called plasma B cells or plasmocytes) are cells of the immune system that secrete large amounts of antibodies. ... Memory B cells are a B cell sub-type that are formed following primary infection. ... Natural NK cells are cytotoxic; small granules in their cytoplasm contain special proteins such as perforin and proteases known as granzymes. ... In cell biology, a lymphokine-activated killer cell (also known as a LAK cell) is a white blood cell that has been stimulated to kill tumour cells. ... Myeloid cells is a subsummating term for all hemopoietic cells except the lymphoid ones (T-cells, B-cells, NK-cells, dendritic cells). ... “White Blood Cells” redirects here. ... Eosinophil granulocyte Basophil granulocyte Granulocytes are a category of white blood cells characterised by the presence of granules in their cytoplasm. ... This article does not cite any references or sources. ... Image of an eosinophil Eosinophil granulocytes, commonly referred to as eosinophils (or less commonly as acidophils), are white blood cells of the immune system that are responsible for combating infection by parasites in vertebrates. ... This article or section does not cite its references or sources. ... Mast cells A mast cell (or mastocyte) is a resident cell of areolar connective tissue (loose connective tissue) that contains many granules rich in histamine and heparin. ... Dendritic cells (DC) are immune cells and form part of the mammal immune system. ... Langerhans cells are immature dendritic cells containing large granules called Birbeck granules. ... Dendritic cells (DC) are immune cells and form part of the mammal immune system. ... Monocyte A monocyte is a leukocyte, part of the human bodys immune system that protect against blood-borne pathogens and move quickly to sites of infection in the tissues. ... A macrophage of a mouse stretching its arms to engulf two particles, possibly pathogens Macrophages (Greek: big eaters, makros = long, phagein = eat) are white blood cells, more specifically phagocytes, acting in the nonspecific defense as well as the specific defense system of vertebrate animals. ... A Histiocyte is a cell that is part of the human immune system. ... Kupffer cells or Browicz-Kupffer cells are specialized macrophages located in the liver that form part of the reticuloendothelial system. ... Langhans giant cells are large cells found in granulomatous conditions. ... Microglia cells positive for lectins Microglia are a type of glial cell that act as the immune cells of the Central nervous system (CNS). ... An osteoclast (from the Greek words for bone and broken) is a type of bone cell that removes bone tissue by removing the bones mineralized matrix. ... A megakaryoblast is a precursor cell to a promegakaryocyte, which in turn becomes a megakaryocyte. ... The megakaryocyte is a bone marrow cell responsible for the production of blood platelets when its cytoplasm becomes fragmented. ... A 250 ml bag of newly collected platelets. ... Myeloid cells is a subsummating term for all hemopoietic cells except the lymphoid ones (T-cells, B-cells, NK-cells, dendritic cells). ... Reticulocyte Erythrocyte Reticulocytes are immature red blood cells, typically comprising about 1% of the red cells in the human body. ... A normoblast (or erythroblast) is a type of red blood cell which still retains a cell nucleus. ...