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(A) When a person attempts to inhale with maximal effort while the nose and mouth are closed,the thoracic cavity expands,which significantly increases

Vedclass · Accepted Answer

$ - 80\;	ext{mm Hg}$

Vedclass · Answer

(A) When a person attempts to inhale with maximal effort while the nose and mouth are closed,the thoracic cavity expands,which significantly increases the volume of the alveoli.According to Boyle's Law,for a fixed amount of gas at a constant temperature,pressure is inversely proportional to volume $(P \propto 1/V)$.As the volume of the alveoli increases rapidly due to the strong contraction of the respiratory muscles (diaphragm and external intercostals),the pressure inside the alveoli drops significantly below atmospheric pressure.In such a forced maneuver,the alveolar pressure can decrease to as low as $-80\;	ext{mm Hg}$ relative to atmospheric pressure.

If a person breathes with maximal effort but with his nose and mouth closed,the alveolar pressure can be decreased to as low as

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