Question

Hypophyseal portal system is found in
A. Kidney
B. Liver
C. Brain
D. Heart

Answer 1

Hypophyseal portal system helps in communicating between the anterior lobe of the pituitary gland and the hypothalamus. It gives out hormonal signals. This system has a very significant role in diseases related to the central nervous system and the pituitary gland.

Complete answer: The hypophyseal portal system is a system of the blood vessels that help in communicating between the anterior lobe of the pituitary gland and the hypothalamus in the brain. The hypophyseal portal system is made up of two capillary beds, one in the anterior pituitary and another in the median. The portal capillary bed in the median prominence arises from the superior hypophyseal arteries. It is divided into parts, the internal and the external plexus. The long portal veins help in carrying the blood coming from the capillary system of the median to the capillary bed in the anterior pituitary. From the capillary bed of the anterior pituitary, the portal blood is drained into the cavernous and the posterior intercavernous sinuses. Therefore, the hypophyseal portal system helps in the transport and the exchange of the hormones between both the glands to ensure faster communication.
Thus, based on the above information we can conclude that the hypophyseal portal system is found in the brain.
Hence, the correct answer is option C.

Note: The hypophyseal portal circulation provides a mechanism to maintain the regulation of the neuroendocrine hormones by the hypothalamus. It is also responsible for homeostasis as it releases different pituitary hormones into the systemic circulation. The main hormones transported by the hypophyseal portal system are the different releasing hormones for gonadotropins, corticotropins, thyrotropin, and growth hormones.