Some Introduction of the Human Heart. The human heart is a hollow muscular organ, conical located between the two lungs above the diaphragm. Two thirds of the heart is to the left of the midline and 1/3 to the right.
In the heart, the corner points down and to the left. It is 5 inches (12 cm) long, 3.5 inches (8.9 cm) wide and 2.5 inches (6 cm) from front to back, and is about the size of a fist .. The heart comprises less 0.5 percent of total body weight.
Internal Layers of Heart
The heart has three layers. The smooth coating, inside the heart, made of epithelial tissues, called the endocardium. The middle layer of the heart muscle is called the myocardium, which is made of cardiac muscles and important part of the heart. It is surrounded by a full call pericardial sac, which is outside fluid.
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