MCAT Question A Day - 4/23/14 - Answer!

A variety of organs with similar functions among the vertebrates are thin, moist, highly vascular, and cover a relatively large surface area. These are necessary characteristics for an efficient

A. heart.

B. blood-brain barrier.

C. neuromuscular interface.

D. respiratory membrane.

The correct answer is (D). Basic knowledge about vertebrate biology is helpful. The characteristics described are shared by structures including gills, lungs, and even the skin of frogs (which can serve as an extra respiratory organ underwater).

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