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return blood to heart, small veins that drain blood from the capillaries and then join to form a vein
transports materials, defends against pathogens, regulates temperature, regulates pH
main functions of blood
red blood cells
live about 4 months, never replicate, concave (which allows them to stack, increases flexibility, and increases surface area)
the increase of pressure as the heart contracts and sends a surge of blood throughout the body
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