The heart has four separate chambers. The upper two chambers are called the right and left atria (RA and LA). The atria are the receiving chambers for blood returning from the body and the lungs. The wall dividing the two atria is called the atrial septum. The lower two chambers are the right and left ventricles (RV and LV).
Read MoreThe heart functions to pump blood to the lungs and the body. In order to pump, the heart requires an electrical impulse just like any other muscle in the body.
Read MoreThe heart itself requires blood to work properly just like any other organ in the body.
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