What is testosterone?

The Open University's senior lecturer, Dr Claire Rostron talks about the so-called sex hormone testosterone, which production begins before birth, influencing the development of the male genitals, the brain, kidneys, muscles, and liver.

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[genevievebarbeau]

Testosterone is worth more than quizosterone.

[orhoushmand]

Testosterone is my worst aesthetical enemy. Testosterone is so devious, it causes hair growth in places where I want my skin to be smooth, and it deepened my voice too much.

[sandrofischer]

and how does testosterone increase muscle mass? like how does it help building up muscles?