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
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