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As in the arteries, the walls of veins have three layers, or coats: an inner layer, or tunica intima; a middle layer, or tunica media; and an outer layer, or tunica adventitia. Each coat has a number of sublayers.
a) microfilaments b) protofilaments c) prototubules d) prototubulins e) microtubular units Answer: b 20) In a normal microtubule, how many protofilaments make up its cylindrical wall? a) 13 b) 15 c) 11 d) 9 e) 17 Answer: a 21) What kinds of forces are thought to hold microtubular structure together?