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You Asked:
Why does synthetic testosterone make muscles bigger? — Ken, Metarie Louisiana
Marshall Answered:
Testosterone is a hormone. That means that it is a molecule with a specific shape that triggers certain behaviors in certain cells of the body. In the case of testosterone, one of its effects is in muscle cells, where it tells them to make more protein. An anabolic steroid is any chemical that mimics the effect of natural testosterone in the muscles. See How Performance-enhancing Drugs Work for more info.
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