Normally, when blood levels of carbon dioxide rise, ____.
A. the rate and depth of breathing increase
B. the rate of breathing increases, and breathing becomes shallow
C. the rate of breathing decreases, and breathing becomes shallow
D. the rate of breathing decreases, but depth of breathing increases
E. the rate and depth of breathing decrease
A. the rate and depth of breathing increase
When blood levels of carbon dioxide rise, the rate and depth of breathing normally increase.
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