During the initial part of inspiration, which of the following does not occur ?
Correct answer: B. Intra thoracic pressure rises
- A. Intrapulmonary pressure falls
- B. Intra thoracic pressure rises
- C. Intra-abdominal pressure rises
- D. The partial pressure of O2 in dead space rises
Explanation
During inspiration, intrapulmonary and intrathoracic pressures fall, while descent of the diaphragm raises intra-abdominal pressure. Fresh inspired air also raises the oxygen partial pressure in the conducting dead space, making a rise in intrathoracic pressure the exception.
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