Final answer:
The hypothalamus and the anterior pituitary gland are two endocrine glands that are linked by a venous blood portal system called the hypothalamic-hypophyseal portal system.
Step-by-step explanation:
The two endocrine glands that are linked by a venous blood portal system are the hypothalamus and the anterior pituitary gland.
The hypothalamic-hypophyseal portal system allows hypothalamic hormones to be transported to the anterior pituitary without first entering the systemic circulation. The system originates from the superior hypophyseal artery, branches into the primary capillary plexus, and then travels through portal veins into the anterior pituitary. This system of blood vessels allows for direct communication between the hypothalamus and the anterior pituitary gland.