Hypophyseal Portal System Capillaries Are

Question

Hypophyseal portal system capillaries are
A) lined by tight junctions.
B) lined by microglial cells.
C) fenestrated.
D) impermeable.
E) lined by podocytes.

Accepted Answer

Hypophyseal portal system capillaries are fenestrated, meaning they have small pores or openings in their walls that allow for the exchange of substances between the blood and surrounding tissues. This allows for hormones to be released directly into the portal system and transported to the pituitary gland. The other choices are incorrect as tight junctions, microglial cells, and podocytes are not associated with capillaries in the hypophyseal portal system, and impermeable capillaries would not allow for the exchange of hormones.