Match the change in gas composition with the response (disregard weak responses).
-Arterioles: systemic dilate, pulmonary constrict.
A)PO₂ increases.
B)PCO₂ increases.
C)PO₂ decreases.
D)PCO₂ decreases.

Question

Quizplus · Accepted Answer

Systemic arterioles dilate in response to a decrease in oxygen levels (PO₂), which suggests a lower gas concentration in the blood. On the other hand, pulmonary arterioles constrict in response to a higher PO₂ concentration.

Answer: B 
 The PCO₂ level is sensed by chemoreceptors in the aortic arch and carotid arteries. Systemic arterioles constrict in response to increased PCO₂, while pulmonary arterioles dilate.

Match the Change in Gas Composition with the Response (Disregard