Question

Match the change in gas composition with the response (disregard weak responses).

Arterioles: systemic constrict, pulmonary dilate.

A. PO₂ increases.
B. PCO₂ increases.
C. PO₂ decreases.
D. PCO₂ decreases.

Answer 1

When blood passes from the arteries to the veins within body tissues, the partial pressure of oxygen (PO₂) decreases, while the partial pressure of carbon dioxide (PCO₂) increases.

Step-by-step explanation:

When blood passes from the arteries to the veins within body tissues, the partial pressure of oxygen (PO₂) decreases, while the partial pressure of carbon dioxide (PCO₂) increases.

This change in gas composition is matched with the response of arterioles constricting systemically and pulmonary arterioles dilating.

Therefore, the correct match for this change in gas composition is:

1. PO₂ decreases
2. PCO₂ increases