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Marysya12 [62]
3 years ago
10

Pulmonary arterioles _____ and system arterioles _____ when PO2 is low. A. dilate, dilate B. dilate, constrict C. constrict, dil

ate D. constrict, constrict Definition C. constrict, dilate
Biology
1 answer:
Sphinxa [80]3 years ago
7 0

Answer:

Pulmonary arterioles <u>constrict</u> and system arterioles <u>dilate</u> when PO₂ is low.

Explanation:

Oxygen partial pressure (PO₂) is a blood perfusion parameter that indicates the O₂ concentration in the blood, related to the O₂ available in the lung alveolus or in the body tissues, at a given time.

Since gas exchange depends on the amount of O₂ and CO₂ -which determines both PO₂  and PCO₂- blood circulation and lung ventilation, a decrease or increase in PO₂  will result in significant vascular changes to ensure O₂ flow in the body.

  • When the PO₂ in the alveolus decreases, the pulmonary arterioles contract, to redirect the blood to other better ventilated alveoli.
  • In the tissues, a decrease in tissue PO₂ causes arterioles dilatation, which should promote the arrival of O₂ in that tissue.

<em>These adaptations make it possible to increase the bioavailability of O₂</em>

<em>and thus increase the PO₂</em>.

Learn more:

PO₂ at the arterial ends of the pulmonary capillaries brainly.com/question/9501095

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