Heartbeat, as the name implies, is the beating of the heart.
The right atrium receives venous blood from the whole body and pumps it out of the pulmonary artery through the right ventricle. At this time, venous blood flows in the pulmonary artery, becomes arterial blood rich in oxygen through gas exchange in the lung, is sent to the left atrium from the pulmonary vein, and is pumped to various tissues and organs of the whole body through the aortic pump of the left ventricle to meet the needs of normal physiological activities.
The right atrium receives venous blood from the whole body and pumps it out of the pulmonary artery through the right ventricle. At this time, venous blood flows in the pulmonary artery, becomes arterial blood rich in oxygen through gas exchange in the lung, is sent to the left atrium from the pulmonary vein, and is pumped to various tissues and organs of the whole body through the aortic pump of the left ventricle to meet the needs of normal physiological activities.