Match the Physiological Factors, Labelled A

Multiple Choice

Match the physiological factors, labelled a. through e., with the descriptions. (Options may be used more than once or not at all.)
-directly stimulates the central chemoreceptors

A) arterial PO₂ between 60 to 100 mmHg
B) arterial PO₂ less than 60 mmHg
C) arterial PCO₂ increased above normal
D) brain ECF H⁺ increased above normal
E) arterial H⁺ increased above normal