The body’s neuromodulation of the cardiovascular system is realized through a variety of cardiovascular reflexes, and both cardiac muscle and vascular smooth muscle receive autonomic innervation. The innervation of the heart includes cardiac sympathetic nerve, cardiac vagus nerve; vascular innervation includes sympathetic constrictor nerve fiber, sympathetic diastolic nerve fiber. 1. Innervation of the heart. (1) cardiac sympathetic nerve: postganglionic fibers release the transmitter is norepinephrine, so that the heart rate accelerated, cardiac conduction accelerated, cardiac contractility enhanced. (2) Cardiac vagus nerve: the transmitter released from the endings of postganglionic fibers is acetylcholine, which slows heart rate, cardiac conduction, and cardiac contractility. 2. Innervation of blood vessels. (1) Sympathetic vasoconstrictor nerve fibers: postganglionic fibers release norepinephrine, causing vascular smooth muscle contraction. (2) sympathetic diastolic nerve fibers: the endings of sympathetic diastolic nerve fibers release acetylcholine during strenuous exercise, causing vasodilatation of skeletal muscle. When the body is not feeling well, should consult the doctor in time, active treatment, do not use drugs privately, so as not to cause danger.