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In response to the signals, the gonads produce hormones that stimulate libido and the growth, function, and transformation of the brain, bones , muscle , blood , skin , hair , breasts , and sex organs.
Encyclopedia of Educational Theory and Philosophy.
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Under the influence of androgens, the voice box, or larynx , grows in both sexes.
One possible cause of a delay in the onset of puberty past the age 14 in girls and 15 in boys is Kallmann syndrome , a form of hypogonadotropic hypogonadism HH.
Description: Growth finishes and adult height is attained as the estradiol levels complete closure of the epiphyses.