During inspiration when the diaphragm contracts, the intrapleural pressure becomes_____________?
Correct answer: C. More negative
- A. Positive
- B. Less negative
- C. More negative
- D. Equal to the intra alveolar pressure
Explanation
Diaphragmatic contraction enlarges the thoracic cavity and makes intrapleural pressure more negative. This increases the transpulmonary pressure gradient and allows the lungs to expand.
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