The heart is the central controlling unit of a body. This is the heart which is responsible for a human life. Its working means you have life; if it’s not, you are dead. The heart is a muscle that centrally regulates the whole body. The heart has four chambers, also called valves—two upper and two lower. These valves expand and contract to take and release blood from and to the body. The functioning is classified into two stages. In the first stage, upper chamber contracts and sends the blood to the lower chambers. The four chambers are named as right atrium, right ventricle, left atrium and left ventricle. The blood is pushed from the right atrium to the right ventricle and from the left atrium to the left ventricle. In the second stage, this blood is pushed out of the heart. Right after this activity the heart relaxes and gets ready to take in blood again. This continues further.
How Does a Human Heart Work?
