Fenestrae are structures that:
a. Allow communication between smooth muscle cells otherwise separated by an elastic lamina in the tunica media
b. Allow for the diffusion of molecules between the cytoplasm of the endothelium and underlying smooth muscle cells
c. Anchor the bases of valves to the endothelium of lymphatic vessels
d. Carry electrical impulses in the endocardium of the heart
e. Penetrate through the cytoplasm of endothelial cells of capillaries
ANS: E
Fenestrae are carefully constructed "holes" in the cytoplasm of capillary endothelial cells that permit a ready transport of fluid between the capillary and surrounding tissues.
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