Question

hypothalamic-hypophyseal portal system
what is delivered over the hypothalamic-hypophyseal portal system?
trophic hormones
stimulating hormones
releasing and inhibiting hormones
tropic hormones

Explanation:

The hypothalamic - hypophyseal portal system is a vascular connection between the hypothalamus and the anterior pituitary. The hypothalamus secretes releasing and inhibiting hormones. These hormones are transported through the hypothalamic - hypophyseal portal system to the anterior pituitary. Releasing hormones stimulate the anterior pituitary to secrete its hormones, while inhibiting hormones prevent the anterior pituitary from secreting its hormones.
Trophic hormones (also called tropic hormones) are hormones of the anterior pituitary that act on other endocrine glands (e.g., thyroid - stimulating hormone acts on the thyroid). Stimulating hormones is a rather general and less specific term compared to the precise function of the hypothalamic - hypophyseal portal system which is for releasing and inhibiting hormones.

Answer:

Releasing and inhibiting hormones