Which is TRUE regarding the regulation of heart rate?
A. Stimulation of parasympathetic nerves to the heart causes a slowing of heart rate.
B. A person whose heart lacks autonomic innervation has a faster heart rate at rest than a person with a normally innervated heart.
C. Stimulation of sympathetic nerves to the heart causes an increase in heart rate.
D. The slope of diastolic depolarization in SA node cell action potentials determines the heart rate.
E. All of the choices are true.
Answer: E
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