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Hormones are chemical substances that help to regulate processes in the body. Hormones are secreted by glands and travel to their target organs in the bloodstream. Several hormones are involved in the female menstrual cycle. Hormones can be used to control human fertility and have advantages and disadvantages.

»  Glands and their hormones

         »  Control of internal conditions

                 »  Hormones in the menstrual cycle

                          »  Controlling fertility

                                   »  Benefits and problems of controlling fertility



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