Development of human organs
Pituitary glands secrete harmony which include growth hormones and other stimulating hormones that make other glands such as the testes, ovary, adrenals etc...secrete hormones.
Testosterone is the male hormone and estrogen is the female hormone that bring about development of several secondary sexual characters.
The uterine wall the female prepares itself to receive the developing fertilized eggs. In case there is no fertilization,the thickened lining of the uterus wall breaks down and goes out of the body along with the blood.This is called menstruation.
In girls breast begin to develop where as in boys, facial hair, mustaches and beards begin to grow. The organs which by children are identified as boys or girls at birth represent primary sexual characters.
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