Final answer:
The carotid chemoreceptors are more sensitive to changes in PaO2 levels compared to the aortic chemoreceptors.
Step-by-step explanation:
The carotid chemoreceptors are more sensitive to changes in PaO2 levels compared to the aortic chemoreceptors.
Carotid chemoreceptors are located in the carotid bodies, which are small structures located near the bifurcation of the carotid arteries in the neck. They primarily respond to changes in arterial oxygen levels.
Aortic chemoreceptors are located in the aortic bodies, which are small clusters of cells located along the aortic arch. While they also respond to changes in arterial oxygen levels, they are less sensitive compared to the carotid chemoreceptors.