also called the circulatory system
cardiovascular system
hollow muscular organ that pumps blood throughout the body
heart
recieves blood that comes into the heart
atrium
pumps blood out of the heart
ventricle
flap of tissue that prevents blood from flowing backwards
valve
sends out signals that make the heart muscle contract
pacemaker
blood vessels that cary blood away from the heart
arteries
tiny, narrow, blood vessels
capillaries
blood vessels that carry blood back to the heart
veins
the largest artery in the body
aorta
carry blood to the heart itself
coronary arteries
caused by the alternating expansion and relaxation of the artery wall
pulse
the process in which molecules move from an area of higher concentration to an area of lower concentration
diffusion
the force blood exerts against the walls of the blood vessels
blood pressure
the liquid part of blood
plasma
take oxygen in the lungs and deliver it to cells elsewhere in the body
red blood cells
an iron-containing protein that binds chemically to oxygen molecules
hemoglobin
the body's disease fighters
white blood cells
cell fragments that play a key role in forming blood clots
platelets
your body's drainage system
lymphatic system
consists of water and dissolved matierials such as glucose
lymph
filter lymph
lymph nodes
a condition in which an artery wall thickens as a result of the buildup of fatty materials
atheroschlerosis
when blood flow to a part of the heart muscle is blocked
heart attack
a disorder in which a person's blood pressure is conistently higher than normal- usually defined as greater than 140/90
hypertension

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