Air hunger is the sensation of the urge to breathe. It is usually caused by the detection of high levels of carbon dioxide in the blood by sensors in the carotid sinus and is one of the body's homeostatic mechanisms to ensure proper oxygenation. Natural chemicals in the blood such as adrenalin can also induce an urge to breathe by a separate pathway. Insufficient pulmonary minute ventilation, a sustained breath-hold, constriction of the alveoli of the lungs as in asthma or high ambient levels of carbon dioxide in the air breathed can cause air hunger resulting in a respiratory distress condition characterized by dyspnea, labored breathing or gasping. Air hunger can be very distressing and triggers strong reactions to restore breathing. It has been suggested that this article or section be merged with Sensation and perception psychology. ... Breathing redirects here. ... Carbon dioxide is a chemical compound composed of one carbon and two oxygen atoms. ... Arteries of the neck. ... It has been suggested that Reactive homeostasis be merged into this article or section. ... Epinephrine (INN) or adrenaline (BAN) is a hormone and a neurotransmitter. ... The alveoli (singular:alveolus), tiny hollow sacs which are continuous with the airways, are the sites of gas exchange with the blood. ... Dyspnea (R06. ...
In mammals (with the notable exception of seals and some burrowing mammals) the breathing reflex is triggered by excess of carbon dioxide rather than lack of oxygen, so asphyxiation progresses in oxygen-deprived environments, such as storage vessels purged with nitrogen or helium balloons, without the victim's experiencing air hunger. Orders Subclass Monotremata Monotremata Subclass Marsupialia Didelphimorphia Paucituberculata Microbiotheria Dasyuromorphia Peramelemorphia Notoryctemorphia Diprotodontia Subclass Placentalia Xenarthra Dermoptera Desmostylia Scandentia Primates Rodentia Lagomorpha Insectivora Chiroptera Pholidota Carnivora Perissodactyla Artiodactyla Cetacea Afrosoricida Macroscelidea Tubulidentata Hyracoidea Proboscidea Sirenia The mammals are the class of vertebrate animals primarily characterized by the presence of mammary... Families Odobenidae Otariidae Phocidae Pinnipeds (fin-feet, lit. ... General Name, Symbol, Number oxygen, O, 8 Chemical series Nonmetals, chalcogens Group, Period, Block 16, 2, p Appearance colorless (gas) very pale blue (liquid) Atomic mass 15. ... Asphyxia is a condition of severely deficient supply of oxygen to the body. ...
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