A Simple Guide to the Heart beats, Related Diseases And Use in Disease Diagnosis (A Simple Guide to Medical Conditions, #40)

The heart is the center of the cardiovascular system.

It is a muscular pump of interconnected, branching muscle fibers located between the lungs with two-thirds of the area to the le ft of the midline of the body. Its upper portion or base is at the level of the second rib while lower portion or apex points downwards and to the left resting on the diaphragm at the level of the fifth rib.
It is enclosed by a white fibrous sac called the pericardium which has 2 layers between which is a lubrica...