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system of tiny blood vessels in the walls of the larger vessels
provide nutrients and oxygen to the outer portions of the vessel
gaps of unjoined membrane just large enough to allow limited passage of fluids and small solutes across the capillary wall
cuff of smooth muscle fibers that surround the root of each true capillary at the metarteriole
highly specialized, flattened veins thin thin walls composed of only endothelium
ex. coronary sinus and dural sinus
represents a measure of the amount of friction blood encounters as it passes through the vessels
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