44. Breathing rate increases because of
(A) insufficient oxygen in the blood
(B) excess carbon dioxide in the blood
(C) the accumulation of metabolites in the blood
(D) both A and B
(E) all of A, B, and C
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統計: A(1), B(5), C(0), D(24), E(18) #1122146
統計: A(1), B(5), C(0), D(24), E(18) #1122146