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What is the response of pulmonary arterioles to high alveolar PO2? Describe the ventilation:perfusion ratio and...

What is the response of pulmonary arterioles to high alveolar PO2? Describe the ventilation:perfusion ratio and how it is impacted when alveolar PO2 acutely decreases

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Answer #1

High p02 in alveoli will cause high ventilation but inadequate perfusion.Due to increased ventilation pulmonary arterioles will dilate.

Ventilation perfusion ratio def:
Alveolar ventilation/pulmonary circulation =4lit/5lit=0.8lit

it is used to assess the efficiency and adequacy of the matching the two variables ventilation( ait that reaches the alveoli ) and perfusion(blood that reaches the alveoli)through capillaries.

when alveolar po2 decreases,ventilation decreases and hence v/p ratio decreases.

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