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HEART ATTACKS: THE HEART AND THE BLOOD VESSELS – CAN YOU NOW TELL ME HOW THE CIRCULATION OF BLOOD IS PERFORMED BY THE HEART ?

A schematic representation of the circulation of blood by the heart through the blood vessels is shown in Fig. 3. This figure shows the heart as a double-sided pump, the right and the left. As stated earlier, the right side receives the blood from the whole body and pumps it into the lungs for oxygenation. The left side receives the oxygenated blood from the lungs and pumps it into the aorta, which, through its arterial branches, takes the blood to every part of the body. The arteries are stoutly built tubes made of muscle and elastic tissue. They carry the blood to the head and neck, upper limbs, chest, abdomen, pelvic organs and the lower limbs. As they approach their destination, i.e., the tissues, they divide and subdivide into smaller and smaller branches and finally into capillaries. The latter are the finest of vessels and are spread out into the tissues. The blood is finally collected from the capillaries by the veins, and through them is returned to the right side of the heart, thus completing the circle—from the heart to the lungs, back to the heart, on to the tissues, and back to the heart.

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