13.血管收縮(vasoconstriction)是因血管壁內的平滑肌收縮所致。此平滑肌主要位於血管壁的那一層?
(A)內層(tunica intima)
(B)內皮下層(subendothelial layer)
(C)中層(tunica media)
(D)外層(tunica externa)
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統計: A(703), B(490), C(1515), D(231), E(0) #2182347
統計: A(703), B(490), C(1515), D(231), E(0) #2182347