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Apnea
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'''Apnea, apnoea, or apnœa''' (from the Greek, meaning ''to breathe'') is a term for suspension of external [[breathing]]. During an obstructive apnea event, the upper airway closes, usually at the pharynx, as the muscles of the throat and tongue relax. There is strong respiratory effort, but no airway. During a central apnea (CSA) there is no respiratory effort from expansion of the chest and diaphram [[respiration]] and the volume of the lungs initially remains unchanged. See also [[Obstructive Sleep Apnea sleep apnea (OSA)]] and [[Central Sleep Apnea sleep apnea (CSA)]]
[[Category:Medical terms]][[Category:Conditions]]
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