| A | B |
|---|
| myocardium | Thick, middle muscle layer of the heart |
| atrium | Upper chamber of the heart |
| ventricle | Lower chamber of the heart |
| pulmonary circulation | Pathway between the heart & lungs |
| systemic circulation | Pathway between the heart & all of the body except the lungs |
| valve | Prevents backflow of blood |
| pacemaker | Sinoatrial node- cardiac muscles in the right atrium |
| aorta | Large blood vessel carrying blood from the left ventricle |
| artery | Carry blood away from the heart |
| capillary | smallest blood vessels |
| vein | Carry blood toward the heart |
| atherosclerosis | Plaque builds up on the walls of arteries |
| plasma | Fluid making up 55% of blood |
| hemoglobin | Iron-containing protein in red blood cells |
| phagocyte | White blood cell that engulfs foreign cells |
| platelet | cell fragment released by bone marrow |
| lymph | Fluid lost by blood |
| pharynx | Connects the mouth with the digestive tract |
| larynx | Contains the vocal cords |
| trachea | windpipe |
| bronchus | Leads from trachea to lung |
| alveolus | Air sacs where gas exchange occurs |
| diaphragm | Muscle at the bottom of the chest cavity |
| nicotine | Stimulant in tobacco |
| emphysema | Disease in which lungs lose elasticity |
