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anatomy of blood vessels
thin tunica externa
thick tunica media
narrow and regular tunica intima
thick tunica externa
thin tunica media
irregular tunica intima
layer of endothelium
layer of smooth muscle and elastic fibers
layer of collagen fibers
most superficial tunic
thin tunic of capillaries
specially thick in elastic arteries
contains smooth muscle and elastin
has a smooth surface to decrease resistance to blood flow.
veins need valves to create pressure to pump the blood to the heart. valves assist in returning venus blood to the heart.
why are valves present in veins but not in arteries
muscular pump (milking action of skeletal muscle) and respiratoy pump (thoraxic cavity pressure)
name two events occurring within the body that aid in venous return
because arteries are closer to the pumping action of the heart, their walls must be strong enough to take the changes in pressure.
why are the walls of arteries proportionately thicker than those of the corresponding veins
the arterial system has one of these, the venous system has two.
these arteries supply the myocardium
internal carotid and vertebral
two paired arteries serving the brain
longest vein in the lower limb
artery on the dorsum of the foot checked after leg surgery
deep artery of the thigh
serves the posterior thigh
supplies the diaphragm
formed by the union of the radial and ulnar veins
basilic and cephalic
two superficial veins of the arm
artery serving the kidney
veins draining the liver
artery that supplies the distal half of the large intestine
drains the pelvic organs
what the external iliac artery becomes on entry into the thigh
major artery serving the arm
supplies most of the small intestine
join to form the inferior vena cava
an arterial trunk that has three major branches, whic run to the liver, spleen and stomach
major artery serving the tissues external to the skull
anterior tibial, fibular and posterior tibial
three veins serving the leg
artery generally used to take the pulse at the wrist