Due to dual innervation of the heart,
A. the autonomic nervous system and somatic motor system control heart function.
B. heart rate can increase due to sympathetic regulation and voluntarily through cerebral activity.
C. heart rate can decrease due to parasympathetic regulation and voluntarily through cerebral activity.
D. heart rate can increase under sympathetic regulation or decrease under parasympathetic regulation, meeting the demands of the body.
Answer: D
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