Discussion
The ..................... are primarily responsible for development of secondary sexual characteristics and sexual maturity.
Answer: D
The answer is the gonadal hormones.
At puberty the gonads, the testes and the ovaries, secrete sex hormones, the androgens such as testosterone in males and the oestrogens such as estradiol in females. Together they bring about the secondary sexual characteristics, such as breast development, a deeper voice and body hair, and sexual maturity.
Testosterone, estrogen and estradiol are each individual hormones within this group, and each acts mainly in one sex. The question asks for the hormones responsible in general, which is the group name, gonadal hormones.
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