Final answer:
The hypothalamic-hypophyseal portal system ensures the controlled release of hormones from the hypothalamus to the pituitary.
Step-by-step explanation:
The hypothalamic-hypophyseal portal system ensures the controlled release of hormones from the hypothalamus to the pituitary. The system allows hypothalamic hormones to be transported to the anterior pituitary without first entering the systemic circulation. This is achieved through a network of blood vessels called the hypophyseal portal system, which carries the hormones directly to the anterior pituitary.