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THE HEART IS AN ORGAN OF THE HUMAN BEING.The Heart
To move blood within the circulatory system a pump is necessary. ... The interior of the heart is lined by the endocardium that is homologous with the intima of the blood vessels. The heart is surrounded by a fibrous double-walled pericardial sac that contains a proteinaceous lubricating fluid between the layers. The upper thin walled chambers of the heart, the atria, are separated from the lower, more muscular chambers, the ventricles, by valves that open and close in a coordinated manner to efficiently pump blood to the lungs for gas exchange and to the rest of the body.
Blood enters the heart via the vena cava into the right atrium. ...
The heart beats in an orderly sequence due to the characteristics of the heart muscle and a specialized electrical conduction system. ... They spontaneously generate action potentials at a faster rate than other heart tissue. The primary pacemaker of the heart, the sinoatrial (SA) node, is located at the junction of the vena cava and right atrium.
Approximate Word count = 811
Approximate Pages = 3.2
(250 words per page double spaced)
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