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atrium

upper chamber of the heart that receives and holds blood that is about to enter the ventricle

ventricle

a chamber of the heart that receives blood from an atrium and pumps it to the arteries

valve

flap of tissue in the heart that prevents blood from flowing in the wrong direction

artery

a blood vessel that carries blood from the heart to the body

capillary

any of the minute blood vessels connecting arterioles with venules

vein

a blood vessel that carries blood from the capillaries toward the heart

aorta

the large trunk artery that carries blood from the left ventricle of the heart to branch arteries

coronary artery

the artery that branches from the aorta to supply blood to the heart

diffusion

process by which molecules tend to move from an area where they are more concentrated to an area where they are less concentrated

blood pressure

the pressure of the circulating blood against the walls of the blood vessels

plasma

colorless watery fluid of blood and lymph containing no cells and in which erythrocytes and leukocytes and platelets are suspended

hemoglobin

a hemoprotein composed of globin and heme that gives red blood cells their characteristic color

platelet

a cell fragment that plays an important part in forming blood clots

lymphatic system

the interconnected system of spaces and vessels between body tissues and organs by which lymph circulates throughout the body

atherosclerosis

condition in which fatty deposits called plaque build up on the inner walls of the arteries

hypertension

a common disorder in which blood pressure remains abnormally high (a reading of 140/90 mm Hg or greater)

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