What is the main function of heart
In the heart, there are 4 valves that allow the blood to move in 1 direction only. For example, the aortic valve opens when the ventricle contracts and closes immediately when the heart relaxes, preventing the blood from returning back to the left ventricle.
In addition to the muscle and the valves, the heart is made of a complex electrical system that allows the muscle to pump continuously and predictably. Electrical impulses are generated from a site in the right atrium called the sino-atrial node. This serves as the natural pacemaker of the heart, generating electrical impulses at the normal resting rate of 60 to 100 beats per minute. At a rate of 60 beats per minute, the heart con ...more