Menstrual Cycle Lab - Dustin Lee 5. 6. 7. 8. Menstrual...

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Dustin Lee Menstrual Cycle Lab Block C: Biology 1. Estrogen levels are highest on the 11 th day. 2. LH levels are highest on the 13 th day. 4. Estrogen controls the amount of LH during menstruation. Estrogen thickens the uterine lining to support an embryo if fertilization occurs. When the follicle is mature, a surge in LH secretion from the pituitary causes ovulation. Estrogen blocks the LH surge and block ovulation. After ovulation, the remains of the follicle in the ovary create the corpus luteum. Lutenizing hormone stimulates the corpus luteum to produce progesterone and estrogen, which stimulates vascularization and lining formation of the uterus in preparation for implantation of the fertilized egg. If no fertilization occurs, the increased estrogen and progesterone block LH production. Without LH, the corpus luteum atrophies and progesterone levels fall. Without progesterone, the thickened, spongy uterine wall that had been prepared for implantation breaks down.
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This note was uploaded on 09/21/2011 for the course BIOG 1110 taught by Professor Randywayne during the Spring '09 term at Cornell University (Engineering School).

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