When pressure inside the alveolus exceeds atmospheric pressure _________________.

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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.

BIO 112-Intro. Human Physiology-861, 862, 863 Quiz 12

When pressure inside the alveolus exceeds atmospheric pressure _________________.

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BIO 112-Intro. Human Physiology-861, 862, 863 Quiz 12

When pressure inside the alveolus exceeds atmospheric pressure _________________.

View Explanation

Log in for full answers

Similar Questions

During the inspiratory portion of a respiratory cycle, the airway resistance is reduced because the distending force exerted by the positive Blank ______ pressure keeps the smaller airways that lack cartilage from collapsing.

The difference in pressure between the alveolar and intrapleural spaces is known as the Blank ______.

During heavy breathing, expiration through the lungs is _____. During normal breathing expiration is _____.

Which of the following best describes movements of the throracic wall?

下列哪项最能描述胸壁的运动？

The work of breathing is described as the total work required to move the chest wall and expand the lungs. Which of the following factors does not contribute to the work of beathing?

Which of the following statement most accurately describes the relationship between the contracting muscles, the pressure or resistance change, and the movement of air during quiet breathing in a healthy individual.

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Making Your Study Simpler

During heavy breathing, expiration through the lungs is _. During normal breathing expiration is _.