40. Circulatory System
Gas Exchange
Multiple Choice
Multiple ChoiceWhat happens when the CO2 level from cellular respiration increases in the blood?
A
Cellular respiration decreases.
B
The pH of the cerebrospinal fluid also increases and is detected by O2 sensors in arteries near the heart.
C
The O2 level automatically increases.
D
The medulla, moderated by the pons, signals the heart muscle to beat harder, bringing in more O2.
E
A decrease in the pH of the cerebrospinal fluid triggers the brain's breathing control centers, which stimulate diaphragm and rib muscle contractions.
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