What is the effect of sympathetic nerves on the heart

The sympathetic nerves are part of the autonomic nervous system. The activity of the sympathetic nerves is mainly to ensure the physiological needs of the human body when it is nervous. Many people want to know the effect of the sympathetic nerves on the heart. Generally speaking, when the sympathetic nerves are excited, cardiac output can be accelerated.

1. Sympathetic nerve excitement, that is, increase, will lead to an increase in norepinephrine, an increase in cardiac output, and thus an increase in myocardial oxygen consumption, which may accelerate the incidence of coronary heart disease. The vagus nerve mostly acts at night and has a certain effect of lowering heart rate.

2. The sympathetic nervous system is part of the autonomic nervous system. It consists of the central part, sympathetic trunk, ganglia, nerves and plexuses. The central part is located in the lateral corners of the gray matter of the entire length of the thoracic spinal cord and the 1st to 3rd lumbar spinal segments. The sympathetic trunk is located on both sides of the spine and is composed of sympathetic trunk ganglia and interganglionic branches. It can be divided into five parts: cervical, thoracic, lumbar, sacral and coccygeal. Regulates the activity of the heart and other internal organs.

3. The sympathetic nervous system is an important part of the autonomic nervous system. Nerve fibers from the spinal cord go to the sympathetic ganglia, and then fibers from there are distributed to the internal organs, cardiovascular system, and glands. The main functions of the sympathetic nervous system are to dilate the pupils, increase the heartbeat, contract the blood vessels of the skin and viscera, dilate the coronary arteries, increase blood pressure, dilate the small bronchi, weaken gastrointestinal motility, relax the bladder wall muscles, reduce saliva secretion, secrete sweat from the sweat glands, and contract the arrector pili muscles. When the body is in a state of tense activity, sympathetic nervous activity plays a major role.

4. In daily life, you should have moderate exercise. But no special sports are required. Even if you take a short break during your work, doing some deep breathing and simple exercises will have a better effect.