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vasa vasorum

system of tiny blood vessels in the walls of the larger vessels
provide nutrients and oxygen to the outer portions of the vessel


reduction in the lumen diameter as the smooth muscle contracts


increase in lumen diameter as smooth muscle relaxes


open space through which blood flows


spider-shaped smooth muscle-like cells that stabilize the capillary wall

intercellular cleft

gaps of unjoined membrane just large enough to allow limited passage of fluids and small solutes across the capillary wall

kupffer cells

large macrophages tat remove and destroy any contained bacteria


the flow of blood from an arteriole to a venule through capillary beds

precapillary sphincter

cuff of smooth muscle fibers that surround the root of each true capillary at the metarteriole

varicose veins

results from a leakage in the valves of veins typically in the lower limbs

venous sinuses

highly specialized, flattened veins thin thin walls composed of only endothelium
ex. coronary sinus and dural sinus

collateral channels

provide an alternate pathway for blood to reach a given body region

peripheral resistance

represents a measure of the amount of friction blood encounters as it passes through the vessels


the rising and falling of blood pressure due to the pulsing blood

vasomotor fibers

sympathetic fibers of the vasomotor centers that transmit relatively continuous impulses

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