In the healthy adult, ____ is a reflex mechanism that opens collapsed areas of the lung.

Question

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Sighing is a reflex mechanism that opens collapsed areas of the lung. During a sigh, a larger breath than normal is taken in, followed by a brief period of breath-holding before exhaling. This causes small air sacs in the lung called alveoli to expand and remain open, preventing their collapse. Coughing and yawning serve different purposes and stretching is not a reflex mechanism that opens collapsed areas of the lung.

In the Healthy Adult, ____ Is a Reflex Mechanism That