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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 movement respiratory effort from expansion of the muscles of chest and diaphram [[respiration]] and the volume of the lungs initially remains unchanged.See also [[Obstructive Sleep Apnea (OSA)]] and [[Central Sleep Apnea (CSA)]]