Question

Human heart is myogenic, yet a parasympathetic nerve can reduce the heart rate. Name the nerve.

Answer 1

The heart is influenced by the autonomic nerves originating from the cardiac centre from the medulla oblongata and reach here through the autonomic nervous system. These are parasympathetic and sympathetic nerves. They are antagonistic to one another. The vagus nerves (parasympathetic) supply mainly the SA and AV node and atrial muscle. Parasympathetic stimulation reduces the rate at which impulses are produced, decreasing the rate and force of the heartbeat.