Question

Part 1C - Reproductive System Activities DOLFO Activity 1 - Ovarian and Uterine Cycles 1. In general, how often is a mature ovum released? 2. High plasma levels of estrogen released from a mature follicle stimulates a spike (surge) in which hormone? 3. The follicle that ruptured and released the egg now forms the corpus luteum. What is the role of the corpus luteum? 4. Which hormone steadily increases during the first half of the menstrual phase of the uterine cycle? 5. When levels of estrogen and progesterone decline at the end of the luteal phase, what happens to the endometrium? 6. If pregnancy occurs what happens to the lining of the endometrium? Toil

Answer 1

O The release of ovum from the ovary is termed as ovulation In the Menstrual cycle the mid dap is ovulator day. Answer and Explanation Generally occure one Egg released a a dle is considered to be of 28 day. so the outation in range of 14-16th day. prom ovary alternatevely. The mature grafian follice releases more of Estrogen, this esbogen af high level stimulates the guage of 14 causes release of Leutraining Homone, This LH surge onum. 3 which AHer ovulation the mature Goagian police becomes corpus luteum stable for 14 days if pregnency/ fertilisation does not occure. The coxpus leuleum secrete PROGESTERON which maintain the pregnene by increasing vascularite and thickness of endomatijum! If Pregneno does not occuer the corpus luteum degenerate and forms corpus albicans and progesteron level dedines The uterine qcle is divided into three phase 0 Bleeding phase ③ Proliferative phase ® secretos phase, The level of Estogen in the Bleeding phase fixot increases steadily and u then at the end lit decreases . causes After ovulation cospus luteum is formed and liteal phase is orary starts. The leureal phase last for 14 days ifperti isation not occur it degenerates and stops secrefing pROGESTERON The espogen and progesteron are required to hold and sleppest the pregoena. The esmogen causes myomanium and Hypertrophy Progesteron Endom abium Hyperplasia when progesteron decrease the rascular te Thickning af Endomatrium shed oft bleeding O If pregneny occurs the endomamums thíckens, become more rasculaused in the effect of progesteron. the placenta develops on the Endomatrium, and this thickness semains for the next 9 months. and start