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MCAT Question A Day - 7/10/14 - Answer!

Thinner liningof thFallopian tubes are covered with a layeof cilia. The purpose of thilayer ito:

A.  remove particulatmatter that becometrapped in the muculayer coverinthe Fallopian tubes.
B.  maintain layer of warm air close to the inner liningprotecting the ovum from temperature changes occurring in the external environment.
C.  kill incoming sperm, thupreventing fertilization
D.  facilitate movement of the ovum towards the uterus.

D is correct. The layer of cilia along the inner lining of the Fallopian tubes serves to help the egg cell move towards the uterus, where it will implant if it has been fertilized. (Fertilization usually happens in the Fallopian tubes.) A describes what the ciliary lining in the respiratory tract does. B may sound good, but the Fallopian tubes are far enough away from the extemal environment that protection from its temperature fluctuations is not an issue. C would seem to gum up the whole "continuation of the species" plan. It's not a good answer.