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eupnea : ウィキペディア英語版
eupnea
In the human respiratory system, eupnea or eupnoea (Greek ''eupnoia''; from ''eu'', well + ''pnoia'', breath) is normal, good, unlabored ventilation, sometimes known as ''quiet breathing'' or ''resting respiratory rate''. In eupnea, expiration employs only the elastic recoil of the lungs.
Eupnea is the natural breathing in all mammals, including humans. Eupnea does not require any volitional effort whatsoever, but occurs whenever a mammal is in a natural state of relaxation, i.e. when there is no clear and present danger in their environment. When a mammal perceives potential danger, eupnea stops, and a much more limited and labored form of breathing occurs.
Eupnea is an incredibly efficient and effective form of breathing, which maximizes air intake, and minimizes muscular effort.
During eupnea, neural output to respiratory muscles is highly regular, with rhythmic bursts of activity during inspiration only to the diaphragm and external intercostal muscles.
==See also==

*List of terms of lung size and activity
*Respiratory rate

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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