| A | B |
|---|
| pericardium | the double walled membranous sac that enclosed the heart |
| cardiovascular | pertaining to the heart and the blood vessels |
| epicardium | the external layer of the heart and also is the part of the inner layer of the pericardial sac |
| myocardium | middle and thickest of the three layers consists of the cardiac muscle. |
| endocardium | the lining if the heart forms the inner surfaces that comes in direct contact with blood being pumped through the heart. |
| atria | the two upper chambers of the heart are the recieving chambers all the blood vessels coming into the heart enter here |
| atrium | this is where all blood vessels enter the heart |
| cardiac apex | the narrow tip of the heart |
| septum | a separating wall or partition |
| pulmonary circulation | is the flow of blood between the heart and lungs |
| eletrical impulses | the rate and regularity of the heartbeat |
| capillaries | serve as the automatic units connecting the arterial and venous circulatory systems |
| arterioles | which are the smaller thinner branches of arteries, carry blood to the capillaries |
| venae cavae | are the two large veins that enter the heart |
| venules | are small veins that join to form the larger veins |
