Find 
by implicit differentiation. 
Definitions:
Substrate
A surface or material on or from which an organism lives, grows, or obtains its nourishment.
Human Chorionic Gonadotropin
A hormone produced during pregnancy that supports the normal development of an egg in a woman's ovary, and stimulates the release of the egg during ovulation.
ACTH
Adrenocorticotropic hormone (ACTH) stimulates the adrenal glands to release cortisol.
ADH
Antidiuretic Hormone, also known as vasopressin, a hormone released by the posterior part of the pituitary gland that conserves water in the body and regulates its balance.
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