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A&P Chap 13 Mar/Bart


Arteriole A small arterial branch that delivers blood to a capillary network
Arteries Blood vessels that carry blood away from the heart and toward a peripheral capillary
Capillary Small blood vessels, interposed between arterioles and venules, whose thin walls permit the diffusion of gases, nutrients, and wastes between the plasma and interstitial fluids
Venule Thin-walled veins that receive blood from capillaries
Tunica A layer or covering; in blood vessels: tunica externa, the outermost layer of connective tissue fibers that stabilizes the position of the vessel; tunica interna, the innermost layer, consisting of the endothelium plus an underlying elastic membrane; tuni
Vasoconstriction A reduction in the diameter of arterioles due to contraction of smooth muscles in the tunica media; elevates peripheral resistance; may occur in response to local factors, the action of hormones, or stimulation of the vasomotor center
Vasodilation An increase in the diameter of arterioles due to the relaxation of smooth muscles in the tunica media; reduces peripheral resistance; may occur in response to local factors, through the action of hormones, or following decreased stimulation of the vasomot
Created by: nysveryown
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