Normal intrapleural pressure during the start of inspiration is _________ mm of Hg?
Correct answer: A. -2
- A. -2
- B. -5
- C. 0
- D. -7
Explanation
At the start of inspiration, intrapleural pressure is subatmospheric, approximately −2 mmHg in commonly used clinical approximations, and becomes still more negative during inspiration. This negative pressure helps expand the lungs.
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