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AnS 214 SI Session 20 Monday, 2/24, 4pm A. Oogenesis and the sexual cycle. 1) Name 3 types of cycles defined for female organisms and define each: ________________: ________________: ________________: 2) Name 2 phases of the ovarian cycle. When does ovulation occur? 3) Fill in the table below with information regarding the maturation stages of oocytes. Primordial Primary Secondary Tertiary/Graafian/Antral /Ovulatory-sized Meiotic status of oocyte Surrounded by... Antrum? Picture 4) After ovulation, what structure(s) are formed on the ovary? What cells make up this structure? What hormones are secreted by this structure? 5) What two developmental paths may be taken by the structure above? B. The ovarian cycle, estrogen. 1) Fill in the diagram at right with pertinent stages of the ovarian cycle. 2) Estrogen is produced by ____________________________ in the ovary, by converting ___________________ to ___________________ in response to the hormone ___________________ from the anterior pituitary. The substrate for estrogen formation is produced in the ___________________, in response to the hormone ___________________ from the anterior pituitary. Both of the pituitary hormones are produced in response to ___________________ from the ___________________. High estrogen levels in late follicular stages increase the production of ___________________, ___________________, and ___________________. This is called ___________________ feedback. Progesterone is produced by ___________________ in the CL. In the brain, it inhibits the production of ___________________, ___________________, and ___________________. This ___________________ follicular development. During pregnancy, progesterone ___________________ uterine contractions, and causes the uterus to secrete ___________________, supporting gestation. Progesterone causes oviduct peristalsis ___________________ the uterus. Progesterone production is stopped by the destruction of the ___________________, under the effects of ___________________ from the uterus. C. The estrous cycle. 1) Fill in the diagram below with all 3 elements of the estrous cycle 2) Fill in the table below with changes seen in the 2 stages of the ovarian cycle. Stage Primary hormonal influence Physiological changes 3) Fill in the table below with changes seen in the 3 stages of the uterine cycle. Stage Primary hormonal influence Physiological changes 4) What happens in the uterine cycle in the absence of pregnancy? D. Pregnancy and Childbirth. 1) What is average gestation length in humans? 2) Fill in the table with the roles of the primary hormones of preganancy. Hormone Produced by.... Effect HCG Estrogen Progesterone