Function of heart explain?
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Answer:
human heart is an organ that pumps blood throughout the body by the circulatory system supplying Oxygen and nutrients to the tissues and removing carbon dioxide and other wastes.
The most vital function of heart is heart beats which takes place all the time throughout one’s life. The sequence of events which takes place during the completion of one heart beat is called the cardiac cycle. It involves repeated rhythmic contraction and relaxation of heart muscles. Contraction is called systole and relaxation is called diastole. The cardiac cycle involves the following:
During the timewhen the muscles of all four chambers of the heart are relaxed, the blood returning to the heart under low pressure in the veins enters the two atria. Blood from large veins, called vena cava pours into right atrium. This blood comes from head, upper body parts and lower body parts where oxygen has been used up and the blood is free from oxygen i.e., deoxygenated. Thus, the deoxygenated blood enters the right atrium. At the same time, the pulmonary vein from lungs pour oxygenated blood into the left atrium. Thus, the oxygenated blood enters the left atrium.
As the right and left atria fill with blood, pressure in them rises so that the valves between left atrium and left ventricle (bicuspid valve) and between right atrium and right ventricle (tricuspid valve) open and the atria contract. Atrial contraction (artrial systole) forces pumping of deoxygenated blood from right atrium into the right ventricle through tricuspid valve and oxygenated blood from left atrium into left ventricle through bicuspid valve.
Almost immediately the ventricles contract. This is called ventricular systole. During contraction of ventricles, the deoxygenated blood from right ventricle flows to the lungs through pulmonary artery and the oxygenated blood from left ventricle is distributed to all the parts of the body through the largest artery, called aorta.