Jeff is 13 years old and he has recently noticed some remarkable changes in himself.Over the past few months his voice has started to change,growing deeper.He has begun to grow pubic hair,as well as the beginnings of a facial beard.He is also filling out,with his muscles developing rapidly.These changes in Jeff are probably due to the action of the _____________.
A)gonads
B)thyroid gland
C)pineal gland
D)adrenal gland

Question

Quizplus · Accepted Answer

The specific changes described in Jeff are consistent with the effects of increased testosterone production, which is mainly produced by the testes in males. Therefore, the gonads are likely responsible for the changes observed in Jeff. The thyroid gland is responsible for regulating metabolic rate, the pineal gland produces melatonin to regulate sleep, and the adrenal gland produces hormones such as cortisol and adrenaline to regulate stress response. While these glands also play important roles in the body, they are not directly responsible for the changes observed in Jeff.

Jeff Is 13 Years Old and He Has Recently Noticed