An arteriole is a small diameter blood vessel that extends and branches out from an artery and leads to capillaries. Image File history File links Illu_capillary. ... Image File history File links Illu_capillary. ... Human blood smear: a - erythrocytes; b - neutrophil; c - eosinophil; d - lymphocyte. ... f you all The blood vessels are part of the circulatory system and function to transport blood throughout the body. ... Section of an artery For other uses, see Artery (disambiguation). ... This article or section does not adequately cite its references or sources. ...

Arterioles have thin bitc hass penis(usually only one to two layers of smooth muscle) and are the primary site of vascular resistance^[1].

This means blood pressure in the arteries supplying the body is a result of the interaction between the cardiac output (the volume of blood the heart is pumping per minute) and the vascular resistance, usually termed total peripheral resistance by physicians and researchers. A sphygmomanometer, a device used for measuring blood pressure. ... Cardiac output is the volume of blood being pumped by the heart, in particular a ventricle in a minute. ... Total peripheral resistance refers the cumulative resistance of the thousands of arterioles in the body, or the lungs, respectively. ...

Natural fluctuation

The up and down fluctuation of the arterial blood pressure is due to the pulsatile nature of the cardiac output and determined by the interaction of the stroke volume versus the volume and elasticity of the major arteries. Section of an artery An artery or arterial is also a class of highway. ... Cardiac output is the volume of blood being pumped by the heart, in particular a ventricle in a minute. ... In cardiovascular physiology, stroke volume (SV) is the volume of blood ejected from a ventricle with each beat of the heart. ...

In a healthy vascular system the endothelium, inner lining of arterioles and other blood vessels, is smooth and relaxed. The endothelium is the layer of thin, flat cells that lines the interior surface of blood vessels, forming an interface between circulating blood in the lumen and the rest of the vessel wall. ...

This healthy condition is promoted by the ample production of nitric oxide in the endothelium, which biochemical reaction is regulated by a complex balance of polyphenols, various nitric oxide synthase enzymes and L-arginine. R-phrases , , , , S-phrases , , , Supplementary data page Structure and properties n, εr, etc. ... Polyphenols are a group of plant chemical substances, characterized by the presence of more than one phenol group per molecule. ... The nitric oxide synthases (NOS) are a group of enzymes (EC 1. ... Ribbon diagram of the enzyme TIM, surrounded by the space-filling model of the protein. ... Arginine (symbol Arg or R) is an α-amino acid. ...

Pathology

Any pathology which constricts blood flow, such as stenosis, will increase total peripheral resistance and lead to hypertension. A stenosis is an abnormal narrowing in a blood vessel or other tubular organ or structure. ... This article or section does not cite its references or sources. ...

Medication

The muscular contraction of arterioles is targeted by drugs that lower blood pressure (antihypertensives), for example the dihydropyridines (nifedipine and nicardipine), which block the calcium conductance in the muscular layer of the arterioles, causing relaxation. Antihypertensives are a class of drugs that are used in medicine and pharmacology to treat hypertension (high blood pressure). ... Pyridinium cation of pyridine. ... Nifedipine (brand name Adalat and Procardia) is a dihydropyridine calcium channel blocker. ... Nicardipine hydrochloride (Cardene®) is a medication used to treat high blood pressure and angina. ... Calcium channel blockers are a class of drugs with effects on many excitable cells of the body, like the muscle of the heart, smooth muscles of the vessels or neuron cells. ...

This decreases the resistance to flow into peripheral vascular beds, lowering overall systemic pressure.

Metarterioles

A "metarteriole" is an arteriole which bypasses capillary circulation.^[2]

References

1. ^ http://www3.umdnj.edu/histsweb/lab7/lab7arterioles.html
2. ^ Physiology at MCG 3/3ch9/s3ch9_2