At what point are the peripheral chemoreceptors initially activated?
A) PaO₂ of 60 mmHg
B) PaO₂ of 30 mmHg
C) PaCO₂ of 60 mmHg
D) PaCO₂ of 30 mmHg

Question

Quizplus · Accepted Answer

Peripheral chemoreceptors, particularly the carotid and aortic bodies, are primarily sensitive to decreases in the partial pressure of oxygen (PaO₂) in arterial blood. They are significantly activated when PaO₂ falls to approximately 60 mmHg or below, initiating responses to increase oxygen uptake and delivery to tissues.

At What Point Are the Peripheral Chemoreceptors Initially Activated