Refer to the Figure Featuring the Posterior Pituitary

Refer to the figure featuring the posterior pituitary. The structures labeled 1 in the figure

A) are part of the portal system between the hypothalamus and pituitary gland.
B) carry essential nutrients to the posterior pituitary.
C) release tropic hormones.
D) transport vesicles containing the hormones that end up leaving in the bloodstream at point 2.
E) are axons that stimulate cells in the posterior pituitary to synthesize and then secrete hormones.