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[Music] hi welcome back to three size lessons Cole you K by the end of this video you should be able to describe the roles of hormones in human reproduction including the hormones involved in the menstrual cycle and if you a high tier student then you should be able to describe how the hormones interact in the control of the menstrual cycle in a recent video we saw that hormones are released by glands into the bloodstream hormones travel in the bloodstream and trigger effects in specific target organs scientists call this the endocrine system now a really important role of the endocrine system is in human reproduction during puberty reproductive hormones cause secondary sexual characteristics to develop for example pubic hair in men the testes produced the hormone testosterone testosterone stimulates the testes to produce sperm in women the ovaries produced the hormone estrogen once puberty begins eggs in the ovaries start to mature in every 28 days an egg is released this is called o
