What is heart . How does it work. What are the main things
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a hollow muscular organ that pumps the blood through the circulatory system by rhythmic contraction and dilation. In vertebrates there may be up to four chambers. it work by the contraction and relaxation of the muscles at that time blood flows through it
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what is the blood pumping organ in our body it is covered by membrane is pericardium it is four chambered left auricle right auricle right ventricle left ventricle .heart pumps the blood into the arteries and receive blood from the veins .space between the pericardium membrane is filled with pericardial fluid which prevents protec the heart from External damage and reduce the friction
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