: Hormone Definitions and Measurements 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

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Hormone Definitions and Measurements
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.

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