5- Heart/ heart layers

heart is located

in the mediastinum, not centered, more to the left, size of a fist

myocardium

thick muscular middle layer of the heart. contraction of this muscle layer develops the pressure required to pump blood through the blood vessels

apex

tip of the heart at the lower edge

epicardium

outer layer of the heart, visceral pericardium

parietal pericardium

outer layer of the sac

heart

a muscular pump made up of cardiac muscle fibers, has four chambers, beats 60-100 times a minute

each time cardiac muscle contracts

blood is ejected from the heart and pushed throughout the body w/in blood vessels

pericardium

double-layerd pleural sac that encloses the heart

layers of the heart

endocardium, myocardium, epicardium

endocardium

inner layer lining the heart chambers, smooth thin layer, reduces friction as the blood passes through the heart chambers

visceral pericardium

inner layer of the sac