What causes the heart to beat fast?
Sympathetic fibers increase the heart rate. Cell bodies of the preganglionic fibers are in the T1-T4 segments of the spinal cord. Fibers synapse in the cervical chain ganglia. Postganglionic fibers from here go via the cardiac plexuses to innervate the heart.
Dr. S. Chandra
Dr. S. Chandra, Faculty of Medicine, Memorial University of Newfoundland
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