Impulses carried to the heart by means of fibers that secrete acetylcholine are

a. parasympathetic impulses and the heart rate increases
b. parasympathetic impulses and the heart rate decreases
c. sympathetic impulses and the heart rate increases
d. sympathetic impulses and the heart rate decreases


Answer: b. parasympathetic impulses and the heart rate decreases

Anatomy & Physiology

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