| A | B |
| atrium | the upper chamber of each side of the human heart |
| pulse | can be felt at various locations of the body as the arteries expand and relax |
| stethoscope | an instrument used to hear the heart beat |
| capillaries | have walls only one cell thick so that nutrients, oxygen, and waste materials can transfer back and forth from the tissues to the blood |
| arteries | blood vessels that carry blood away from the heart to other parts of the body |
| heart | a muscle that produces muscular contractions to push blood through the body |
| blood pressure | the force at which blood moves through the arteries |
| veins | blood vessels that carry blood to the heart |
| heartbeat rate | the number of heartbeats per minute |
| ventricle | the lower chamber of each side of the human heart |
| blood vessels | arteries, capillaries, and veins |
| arteriosclerosis | abnormal thickening of artery walls nad clogging of arteries |