circulatory
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| in what direction does blood flow? | from higher to lower pressures
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| describe arteries | carry oxygenated blood away from the heart, link the heart to arterioles, 100-80 mm/Hg, have three tunics
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| describe the tunics of an artery | interna: endothelium & connective tissue, seperated by internal elastic lamina externa: collagen & elasticx fibers, innervated, nourished by capillaries called the vasa vasorum media: smooth muscle, thickest tunic, seperated by external elastic lamina
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| how are deep tunics nourished? | by blood that passes through the lumen
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| describe the contractility of arteries | sympathetic fibers innervate the tunica media... increased stimulation -> vasoconstriction, decreased stimulation -> vasodilation
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