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26 Cards in this Set
- Front
- Back
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which tunic is notably thicker in arteries compared to veins
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tunica media
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what is an elastic artery
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large artery with numerous elastic fibers in the tunica media
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how does the structure of an elastic artery differ from a typical artery
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larger
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2 examples of elastic arteries
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aorta - common iliac artery
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most of the arteries we are studying are ____ arteries
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muscular
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another name for the tunica intima is ____
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interna
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what is a lumen
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opening
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what type of vessel generally has the largest lumen
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vein
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a capillary is a thin-walled ____ consisting of just a ____ ____
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vessel - tunica intima
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the capillary is used for
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exchange of gases, nutrients, wastes, etc. between blood vessels + tissue cells
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what is the purpose of a precapillary sphincter
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band of smooth muscle that controls blood flow into capillary bed
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how do the arteries branch from the human aortic arch
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humans → 3 branches coming off aortic arch (brachiocephalic, left common carotid, & left subclavian)
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how do the arteries branch from the cat aortic arch
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cats → 2 branches coming off aortic arch ( brachiocephalic & left subclavian)
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vessel that returns blood from trunk & lower extremities to heart
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inferior vena cava
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vessel that supplies the small intestines & proximal colon with blood
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superior mesenteric artery
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vessel that network of anastamoses supplying the brain
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circle of willis
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vessel that branch off abdominal aorta supplying lower limbs (via femoral artery)
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external iliac
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vessel that supplies the stomach, liver, & spleen via branches
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celiac trunk
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vessel that returns blood from thoracic regions to SVC
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azygos vein
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vessel that supplies the distal colon
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inferior mesenteric artery
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anastomosis is a union of joining of ____ ____
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blood vessels
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what is the advantage of anastomosis
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allows collateral routes if a vessel is blocked
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a pulse is the difference in
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pressure of blood in an artery
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a pulse is caused by
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expansion and recoil of elastic arteries as pressure changes
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what type of vessels have valves
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veins
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why do veins need valves
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low pressure in veins require valves to keep the blood from pooling or flowing backwards. Arteries have high pressure so that blood keeps moving without the need of valves
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