When pressure inside the alveolus exceeds atmospheric pressure _________________.

Question

BlackTom AI · Accepted Answer

Re-stating the question: When pressure inside the alveolus exceeds atmospheric pressure, ____________.

Option 1: air moves into the lung. This would be true if alveolar pressure were lower than atmospheric pressure, causing air to flow down its pressure gradient into the lungs. Since the condition stated is that alveolar pressure is higher, this option describes the opposite scenario and is therefore incorrect.

Option 2: air moves out of the lung. When the alveolar (intrapulmonary) pressure surpasses atmospheric pressure, air is pushed from the alveoli to the outside environment to equalize the pressures. This matches standard respiratory mechanics during expiration, making this option correct in the given context.

Option 3: the lung collapses. Lung collapse (pneumothorax) is not a direct consequence of alveolar pressure just being higher than atmospheric under normal physiology; it would require a loss of intrapleural pressure or a breach allowing air to escape into the pleural space. Therefore, this option is inaccurate for the stated condition.

Option 4: the lung must be expanding. Expansion of the lung is associated with alveolar pressure being equal to or less than atmospheric pressure during inspiration, not when it exceeds atmospheric pressure. While expansion can occur with active inspiration, this specific condition describes expiration, so this choice is not appropriate here.

Summary: The scenario describes expiration, where intrapulmonary (alveolar) pressure > atmospheric pressure causing air to exit the lungs instead of entering. The remaining options either describe the opposite pressure relationship, a pathological outcome, or a state not congruent with increased alveolar pressure.

When pressure inside the alveolus exceeds atmospheric pressure _________________.单项选择题

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