If a low-land resident ascends to a high mountain altitude,which of the following would be stimulated first?

Question

Quizplus · Accepted Answer

As a low-land resident ascends to a high mountain altitude, the atmospheric pressure drops, leading to a decrease in partial pressure of oxygen (PaO₂). This drop in PaO₂ would stimulate the peripheral chemoreceptors, which are located in the carotid and aortic bodies that detect changes in arterial blood oxygen concentration. The peripheral chemoreceptors are more sensitive to a drop in PaO₂ than central chemoreceptors, which respond to changes in PaCO₂ and H+ levels in the cerebrospinal fluid (CSF). Therefore, choice A is the best answer.

If a Low-Land Resident Ascends to a High Mountain Altitude,which