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How are human hormones defined in the body and how are they measured? I understand that blood tests can be used to measure the amount of a hormone in the body, but how do we know which hormone controls what body function. For instance, how can we prove that testosterone controls growth hormones and muscle building.

closed as too broad by Bryan Krause, LangLangC, DoctorWhom, JonMark Perry, Chris Rogers Jan 20 at 9:37

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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    Hi Cody, welcome to MedSci. Your question is rather too broad. What research have you done on your own? An answer to this would almost be an introductory endocrinology textbook, so you're going to need to narrow it down. You've asked three questions here. I would suggest asking just one. You can ask the other two later. – Carey Gregory Jan 10 at 1:57