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.
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