Contraction
When the muscle in the heart wall works (squeezes) to push the blood through the heart and out into the arteries.
When the muscle in the heart wall works (squeezes) to push the blood through the heart and out into the arteries.
Two arteries arising from the aorta that arch down over the top of the heart and divide into branches. They provide blood to the heart muscle
Refers to conditions existing at birth.