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The Circulatory Syst

TermDefinition
cardiovascular system also called the circulatory system, consists of the heart, blood vessels, and blood
heart a hollow, muscular organ that pumps blood throughout the body
atrium referring to one of the two upper chambers that receives blood into the heart
pacemaker sends out signals that make the heart muscle contract
ventricle referring to one of the two lower chambers the pumps blood out of the heart
valve a flap of tissue that prevents blood from flowing backward
arteries blood vessels that carry blood away from the heart
capillaries tiny, narrow blood vessels where substances are exchanged between the blood and body cells
veins blood vessels that carry blood back to the heart
aorta the largest artery in the body
coronary arteries the term used to describe blood vessels that carry blood to the heart itself in order to supply the cardiac muscle with oxygen-rich blood
pulse caused by the alternating expansion and contraction of the artery walls
diffusion the process by which molecules move from an area of higher concentration to an area of lower concentration
blood pressure a force exerted on the walls of blood vessels that is caused by the force with which the ventricles contract
blood made up of plasma, red blood cells, white blood cells, and platelets
plasma the liquid part of the blood
red blood cells take up oxygen in the lungs and deliver it to cells elsewhere in the body
hemoglobin an iron-containing protein that binds with oxygen
white blood cells the body's disease fighters
platelets cell fragments that play an important part in forming blood clots
lymphatic system a network of veinlike vessels that returns the fluid to the bloodstream
lymph nodes filter lymph, trapping bacteria and other disease-causing microorganisms in the lymph fluid
atherosclerosis a condition in which an artery wall thickens as a result of the buildup of fatty materials
heart attack occurs when blood flow to part of the heart muscle is blocked
hypertension a condition in which a person's blood pressure is consistently higher than normal
Created by: smspartans