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Human Biology Circulatory system

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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)