Heart
The adult human heat is about 5 inches long and 3.5 inches wide, weighing less than 1 pound. The importance of a healthy heart is to circulate blood throughout the body. When the heart stops beating, life stops as well. The heart is located in the thoracic cavity. This places the heart between the lungs, behind the sternum, in front of the thoracic vertebrae, and above the diaphragm. Although the heart symmetrically located, its axis of symmetry is not a long the midline.
The heart is a hollow, muscular, double pump that circulates the blood through the blood vessel to all parts of the body. Surrounding the heart is double layers of fibrous tissue call the pericardium. Between these two pericardial layers is a spaced filled with a lubricating fluid called pericardial fluid prevents the two layers from rubbing against each other and creating friction. The cardiac muscle tissue, also known as the myocardium, makes up the major portion of the heart. On the inner lining lies a......
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