Which of the following statements regarding respiratory mechanics is correct?

Practice question

Question

Which of the following statements regarding respiratory mechanics is correct?

Options

Choose one · Correct answer highlighted

Intrapulmonary pressure is always higher than atmospheric pressure. During expiration, the diaphragm relaxes and moves upward. Correct Air moves into the lungs when intrapulmonary pressure exceeds atmospheric pressure. External intercostal muscles contract during expiration.

Explanation

During expiration, the diaphragm relaxes and moves upward, decreasing thoracic volume and increasing pressure.

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