Sensors are an important part of any feedback system used to maintain homeostasis. The control of breathing rate depends primarily on sensors located on the brainstem were they monitor the _______ levels of the ______
A) O2, blood
B) CO2, blood
C) pH, blood
D) CO2, cerebrospinal fluid
E) O2, cerebrospinal fluid
Answer: D) CO2m cerebrospinal fluid