MCAT Basics (from MedSchoolCoach) The Reproductive System
Oct 7, 2025
Explore the fascinating world of the reproductive system! Discover the intricate processes of spermatogenesis and oogenesis, and how sperm and eggs journey through human reproduction. Unravel the hormonal dance during the menstrual cycle, learn how fertilization occurs, and uncover the connection between maternal age and Down Syndrome risk. Dive into early embryonic stages, from morula to blastocyst, and understand germ layer formation and its significance. Get ready for an engaging deep dive into biology and biochemistry!
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Hormonal Cascade In Follicular Phase
- The follicular phase involves FSH-driven granulosa proliferation and estrogen secretion that raises GnRH and triggers an LH surge.
- The LH surge is the key trigger for ovulation about midcycle.
Ovulation And Corpus Luteum Function
- Ovulation occurs after the LH surge when a mature egg is released into the fallopian tube and is viable roughly 24 hours.
- The ruptured follicle becomes the corpus luteum, secreting progesterone in the luteal phase.
Remember Estrogen vs Progesterone Roles
- Remember: estrogen establishes the endometrium; progesterone protects and maintains it during the luteal phase.
- If pregnancy doesn't occur, the corpus luteum degrades and progesterone falls, causing menstruation.