how do hormones act to bring about onset of puberty.

The onset of puberty starts from the age 10 to 11 years in girls and 11 to 12 years in boys.. The ages vary among individuals. It happens due to the action of hormones. At this time the production of sex hormones (testosterone, estrogen, progesterone) grow slowly resulting in appearance of secondary sex characters. Appearance of pubic hair, growth of testicles in male and breasts in female, growth of over all body size and shape are the examples of secondary sex characters that take place on the onset of puberty. In male the voice becomes coarse, facial hairs begin to grow due to the effect of hormones during puberty.


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