- Review: a hormone is a substance produced by a gland that is released on acts upon another part of the body
o Ex. insulin, testosterone, estrogen
- Important reproductive hormones
o Testosterone – responsible for sperm production and male sex characteristics
o Estrogen – responsible for ovulation (release of an egg from the ovary) and female sex characteristics
o Progesterone – mostly produced by corpus luteum and causes endometrium (lining of uterus) to thicken with blood vessels (to support developing offspring if fertilization happens)
§ No fertilization --> drop in progesterone and estrogen levels --> shedding of endometrium lining --> new follicle formation
§ Fertilization --> constant level of progesterone & estrogen so no shedding of lining and no new follicle formation
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