A&P 2 University Of Memphis -A&P 2 Blood Vessels with complete solutions

A&P 2 University Of Memphis -A&P 2 Blood Vessels with complete solutions arteries - correct answer have thicker walls, more smooth muscle and elastic fibres, and more resilient veins - correct answer thinner walls, larger lumens, lower pressure Blood vessels - correct answer delivery system that begins and ends at the heart Tunica interna (intima) - correct answer endothelial layer that lines the lumen of all vessels Tunica media - correct answer smooth muscle and elastic fibre layer; regulated by sympathetic nervous system; controls vasoconstriction and dilation of vessels Tunica externa (adventitia) - correct answer collagen fibres that protect and reinforce vessels Elastic (conducting) arteries - correct answer large thick-walled with elastin in all three tunics; aorta; large lumen offers low resistance; act as pressure reservoirs (expand and recoil as blood is ejected from the heart) Muscular (distributing) arteries and arterioles - correct answer distal to elastic arteries; deliver blood to body organs; have thick tunica media with more smooth muscle; active in vasoconstriction Arterioles - correct answer smallest of arteries; lead to capillary beds; control flow into capillary beds via vasodilation and constriction capillaries - correct answer Structure of _________ microscopic blood vessels; walls of tunica intima only one cell thick; pericytes help stabilize their walls and control permeability capillary - correct answer _______Functions exchange of gases, nutrients, wastes, hormones, etc.