The respiratory centers regulate the activities of the respiratory muscles by
A) acting directly to change heart rate and cardiac output.
B) responding to conscious control during periods of physiological stress only.
C) adjusting the frequency and depth of pulmonary ventilation.
D) stimulating the nuclei of the parasympathetic nervous system.
E) None of the answers are correct.
C) adjusting the frequency and depth of pulmonary ventilation.
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