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16.1 Science Vocab

cardiovascular system consists of the heart, blood vessels, and blood; also called the circulatory system.
heart a hollow, muscular organ that pumps blood throughout the body.
atrium upper chamber that receives blood that comes into the heart.
pacemaker a group of heart cells that send out signals that make the heart muscle contract.
ventricle lower chamber that pumps blood out of the heart.
valve a flap of tissue that prevents blood from flowing backward.
artery blood vessels that carry blood away from the heart.
capillary tiny, narrow vessels where substances are exchanged between the blood and body cells.
vein blood vessels that carry blood back to the heart.
aorta the largest artery in the body.
coronary arteries carry blood to the heart itself.
pulse the alternating expansion and relaxation of the artery wall.
diffusion the process by which molecules move from an area of higher concentration to an area of lower concentration.
blood pressure a force exerted by blood against the walls of blood vessels.
Created by: S730503