Rapid heartbeat

Normal heart rate should be between 60 and 90 beats per minute. Athletes' heart rate may be slightly slower. The mechanism that controls the speed of a person's heartbeat is as follows: there is a sinoatrial node at the root of the aorta, which automatically emits electrical stimuli at regular intervals, and transmits the current to the heart muscle through the transmission of a conductive beam, causing the heart muscle to contract; It is the heartbeat center, which emits sympathetic nerves that accelerate the heartbeat and vagus nerves that slow the heartbeat. Usually sympathetic and vagus nerves are in a balanced state. In an emergency, the sympathetic nerves excite and accelerate the heartbeat, which increases the amount of blood pumped by the heart every minute and supplies more blood to the whole body to cope with the crisis. During sleep at night, the vagus nerve is excited , Slows the heartbeat, and reduces the blood supply to the body from the heart.