Question

Local perfusion regulation of the lungs depends on

10. Regulation of local perfusion to lung ventilation units depends mainly upon: a. alveolar CO, tension. b. the mixed venous blood (pulmonary arterial) hydrogen ion concentration (pH) c. alveolar O2 tension. d. the mixed venous blood (pulmonary arterial) o, tension e. the balance between sympathetic neural stimulation of vascular smooth muscle and parasympathetic stimulation of airway smooth muscle.

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Answer #1

10. ANS: a) alveolar PCO2.
Explanation:
Generally alveolar PCO2 can regulate the local perfusion ventilation units. Ventilation is air so PO2, perfusion is blood so PCO2.

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