What properties do these two systems share? What properties are different? Which one would be faster? Which one would result in long-lasting changes? Both systems involve chemical messengers that must interact with receptors in order to have an effect. Chemical messengers are used in both the nervous system and the endocrine system. This prevents the alterations in both estrogen and progesterone concentrations that are necessary for successful ovulation and implantation. Why would this be an effective means of contraception? The introduction of relatively low, yet constant, levels of gonadal hormones places the hypothalamus and pituitary under inhibition via negative feedback mechanisms. Most oral contraceptives are made of small doses of estrogen and/or progesterone. Thyroid B Hormone secretion is often regulated through a negative feedback mechanism, which means that once a hormone is secreted it will cause the hypothalamus and pituitary to shut down the production of signals necessary to secrete the hormone in the first place. Master A The _ secretes hormones that regulate the body's fluid levels.
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