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Vessels and Cells part 2

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A	B
red blood cells	contain hemoglobin to carry oxygen
white blood cells	have a nucleus and are large, produce antibodies
platelets	small, cell fragments, no nucleus
arteries	thick walls to withstand and maintain blood pressure
capillaries	walls one cell thick to allow diffusion of nutrients, waste, oxygen and carbon dioxide
veins	thin, flexible walls
plasma	carries most of the carbon dioxide in the blood
smooth muscle	controls the flow of blood in the arteries
skeletal muscle	contractions help push blood in veins back to heart

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