Vascular System
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Vascular
Q. What are precapillary sphincters?
a
Sparsely distributed tunica media comprising a thin layer of smooth muscle
b
Rings of endothelial cells that control the flow of blood into capillaries
c
Smooth muscle found at the venous end of metarterioles
d
Thoroughfare channels that connect arterioles to postcapillary venules
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