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During the prenatal period most differences between men and women arise. This complex process is named: parental sexual differentiation. In this chapter the process of the menstrual cycle and sexual differentiation is discussed. The chemical substances that are created by the endocrine glands and secreted into the bloodstream are called hormones. The effects of hormones are felt rapidly through its secretion into the bloodstream. The hormones that are most important for sex are the following:Testosterone, this hormone belongs to the group called androgens.OestrogensProgesteroneThe endocrine glands that are of interest are those for sex, these are the testes in males and the ovaries in females. The pituitary gland is related to the hypothalamus. The hypothalamus regulates the pituitary, which regulates the ovaries and the testes. Therefore, it has the nickname of master gland. The hypothalamus plays a role in vital behaviours such as drinking, easting and having sex. The pituitary, hypothalamus and gonads (which are the ovaries and testes) work together to regulate the functions needed for sex. Both the testes and the pituitary produce hormones, the most important one in men is testosterone. It has a function in maintaining...
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