The heart is the most important muscular organ that pumps blood through the system of cavities (chambers) and valves into a distribution network called the circulatory system. The humans’ heart location is near the center of the chest cavity. It consists mainly of enduring elastic tissues: the heart muscle (myocardium), which is rhythmically contracted throughout life, sending blood through the arteries and capillaries to the different parts of tissues of the human body. With each contraction, the heart ejects about 60 to 75 ml of blood, and it is forgotten (at an average cutoff frequency of 70 per minute). Over 70 years, the heart produces more than 2.5 billion cuts and injects about 156 million liters of blood. This seems to be an exhaustless pump, the size of a clenched fist weighs over 200 g, lies almost to the side behind the breastbone between the right and left lungs (which partially cover its front surface) and from below contacts the dome of the diaphragm. The shape of the heart is familiar with a truncated cone, slightly convex, like a pear, on one side; The apex location is the left of the sternum and faces the front of the chest. Large vessels flow along from the opposite side of the top (base)which the blood lead the blood to flow.
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