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MCAT Question A Day - 6/8/13 - Answer!

From where do materials move into the filtrate by urinary secretion?

A.  Afferent arteriole
B.  Bowman’s capsule
C.  Efferent arteriole
D.  Peritubular capillaries

The correct answer is (D). Urinary secretion refers to the transport of materials from the blood (peritubular capillaries) to the filtrate at the latter parts of the nephron.