A passenger in a crowded subway train accidentally stepped on Arnold's foot. research suggests that Arnold would be most likely to respond aggressively to this incident if he has a higher than average level of testosterone.
Testosterone is the primary male hormone responsible for regulating sex differentiation and producing male sperm. A hormone made mainly in the testes (part of the male reproductive system). It is needed to develop and maintain male sex characteristics, such as facial hair, deep voice, and muscle growth. Testosterone may also be made in the laboratory and is used to treat certain medical conditions.
Testosterone is an important hormone. It can boost libido, increase muscle mass, sharpen memory, and bump up energy. Yet, most men lose testosterone with age.
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