a red blood cell; contains the protein (hemoglobin) that carries oxygen in the blood.

the heart valve located between the right ventricle and the pulmonary artery; also called the pulmonary semilunar valve.

a recording in visible form of the electrical activity of the heart; also called an ECG.

in cardiology, the wall dividing the right and left sides of the heart.

a substance in the body that speeds up a specific reaction.

difficult or abnormal heart rhythm; includes rhythms that are too fast, too slow, or originate in an area of the heart other than the sinoatrial node; sometimes

the heart valve located between the left ventricle and the aorta; also called the aortic semilunar valve.

a condition that occurs when the arteries that supply the heart muscle become narrowed, thickened, and hardened by the buildup of fatty deposits.

inflammation of a superficial vein caused by the formation of a clot.

designation based on the presence or absence of specific antigens on a person’s red blood cells; A, B, AB, and O are the most common blood types.

diagnostic testing that uses sound waves to visualize the heart.

a physician who diagnoses and treats heart conditions.