Hormones Released into the Interstitial Fluid by the Anterior Pituitary

Multiple Choice

Hormones released into the interstitial fluid by the anterior pituitary enter the circulation easily because

A) the adjacent capillaries are fenestrated to permit passage of large molecules into the circulation.
B) a strong countercurrent mechanism maintains a concentration gradient that draws them in.
C) they pass easily through the infundibulum.
D) they are brought through the choroid plexus by active transport.
E) None of the answers are correct.