Saved He nich of the following statements is true about the regulation of the heart by the autonomic nervous system? Multiple Choice The autonomic nervous system initiates the heart's contractions. Sympathetic rves release.norepinephrine at adrenergic nerve endings that decreases the activities of the sinoatrial and atrioventricular nodes. Parasympathetic nerves release acecholine at cholinergic nerve endings that decreases the activities of the sinoatrial and atrioventricula nodes. The heart is only regulated by the sympathetic nerves, not the parasympathetic nerves.

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