| A | B |
|---|
| myocardium | a thick layer of muscle in the walls of the heart that help pump blood through the body because of their powerful contractions |
| atrium | the upper chamber of the heart that receives the blood |
| ventricle | the lower chamber of the heart that pumps blood out of the heart |
| pulmonary circulation | the pathway of the right side of the heart that pumps blood from the heart to the lungs |
| systemic circulation | the oxygen rich blood that flows into the left side of the heart and is pumped to the rest of the body |
| valve | flaps of connective tissue between the atria and ventricles |
| pacemaker | cells that set the pace for the heart as a whole |
| aorta | a large blood vessel that receives blood from the left ventricle |
| artery | large vessels that carry blood from the heart to the tissues of the body |
| capillary | the smallest of the blood vessels |
| vein | used to return blood back to the heart |
| atherosclerosis | a condition in which fatty deposits called plaque build up on the walls of the arteries |
| plasma | a straw colored fluid that makes up about 55 percent of blood |
| hemoglobin | the iron containing protein that binds to oxygen in the lungs and transports it to tissues throughout the body where the oxygen is released |
| phagocyte | white blood cells called eating cells that engulf and digest foreign cells |
| platelet | a fragment of cytoplasm that is enclosed in a piece of cell and is released into the bloodstream |
| lymph | the fluid that is lost by the blood and returns to the circulatory system |
| pharynx | serves as a passageway for both air and food |
| trachea | the windpipe from which air moves from the pharynx |
| larynx | contains two highly elastic folds of tissue known as the vocal cords |
| bronchus | two large passageways in the chest cavity through wich air passes |
| alveoulus | million of tiny air sacs |
| diaphragm | a large flat muscle at the bottom of the cavity of the lungs |
| nicotine | a stimulant drug that increases the heart rate and blood pressure |
| emphysema | the loss of elasticity in the tissues of the lungs |
