1. A recent news story (not really!) highlighted the near-drowning of a Navy Seal recruit that...

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Medical Sciences

1. A recent news story (not really!) highlighted thenear-drowning of a Navy Seal recruit that deliberatelyhyperventilated before diving into the water. The recruit waspracticing an exercise that required them to hold their breathunderwater for an extended period of time. The recruit reasonedthat hyperventilation prior to the exercise would alter theirphysiology in a way that would increase the length of time theycould hold their breath. Explain the physiological basis of thisbelief (use the terms hypocapnia and hypercapnia in youranswer)
2. The digestive system and respiratory system share somestructures, yet others must be kept separate to prevent choking.Describe how substances that are intended to be swallowed may getâ€œmisdirectedâ€ and lead to choking. Be sure to include allstructures involved.

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Alterations in physiologyHYPERCAPNIACarbon dioxide CO retention or hypercapnia is a known riskof diving that can cause mental and physical impairments leading tolifethreatening accidents Often such accidents occur due toelevated inspired carbon dioxide For instance in cases of COelimination system failures during rebreather dives elevatedinspired partial pressure of carbon dioxide PCO can rapidly leadto dangerous levels of hypercapnia Elevations in PaCO arterialpressure of PCO can See Answer

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