Sympathetic nerves of the heart

The cardiac sympathetic nerves are part of the autonomic nervous system, and their position in our human body is unshakable. I believe that most people know little about it. I don’t know what role it plays in our body. In fact, when we are under stress, sympathetic nervous activity plays a major role in ensuring our physiological needs. Now let me explain to you the detailed role of the cardiac sympathetic nerves in our human body.

1. The sympathetic nerves of the circulatory organs have an excitatory effect on cardiac activity, which can accelerate the heart rate and heart force. For blood vessels, it mainly promotes the contraction of arterioles, thereby increasing the peripheral resistance of blood flow and raising arterial blood pressure. But the actual situation is more complicated and must be treated differently. The blood vessels of most organs in the human body are only innervated by sympathetic nerves. The sympathetic nerves have a significant contractile effect on the blood vessels of the abdominal organs and the skin. The blood vessels of skeletal muscles are innervated by both sympathetic nerves that contract and vasodilate. For the blood vessels of the coronary circulation, the direct effect of the sympathetic nerves is to cause vasoconstriction, but their indirect effect is to cause vasodilation. It has a constricting effect on the blood vessels of the external reproductive organs. Although the blood vessels in the brain and lungs are also controlled by the sympathetic nerves, the effect is very weak.

2. The sympathetic nerves of the digestive organs mainly have an inhibitory effect on gastrointestinal motility, that is, they reduce the tension of gastrointestinal smooth muscle and the frequency of gastrointestinal peristalsis, and weaken the force of peristalsis; but when the tension of gastrointestinal smooth muscle is too low or the activity is very weak, the sympathetic nerves can also enhance its activity. It can promote the salivary glands to secrete thick saliva.

3. The sympathetic nerves of the respiratory organs and sweat glands have an inhibitory effect on the smooth muscles of the bronchioles, which can dilate the bronchioles and facilitate ventilation. Sweat glands are only controlled by sympathetic nerves, and sympathetic nerve excitement causes sweat gland secretion.

Through the above content, everyone has a preliminary understanding of the cardiac sympathetic nerves. Once there is a problem with the heart's sympathetic nerves, sympathetic atrophy will occur. We don't need to be afraid, but we must seek medical attention in time. At the same time, we must also regulate our bodies by quitting smoking and drinking. Finally, I wish you all good health.