The removal of Michael's tumour may have rendered him incapable of producing antidiuretic hormone (ADH).
The pituitary gland is known as the "master gland" because the hormones it generates regulate so many distinct bodily processes. It detects the body's demands and sends messages to various organs and glands to control their activity and maintain a suitable environment. It secretes hormones into the bloodstream that act as messengers to transfer information from the pituitary gland to distant cells, so controlling their activity. For instance, the pituitary gland generates prolactin, which stimulates milk production in the breasts.
The pituitary gland also helps store and secrete two important hormones - Antidiuretic hormone and oxytocin. Anti-diuretic hormone aids in blood pressure regulation by working on the kidneys and blood arteries. Its most significant function is to conserve fluid volume by decreasing the amount of water lost through urine.
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