A woman asks why menstrual bleeding begins when pregnancy does not occur. Which explanation is most accurate?
Correct answer: A. The fall in ovarian hormones causes endometrial shedding
- A. The fall in ovarian hormones causes endometrial shedding
- B. The rise in human chorionic gonadotropin causes uterine bleeding
- C. The sudden release of follicle-stimulating hormone destroys the endometrium
- D. The increase in oxytocin causes the functional layer to detach
Explanation
When the corpus luteum regresses, progesterone and estrogen levels fall, causing the functional endometrial layer to shed. Human chorionic gonadotropin is produced after implantation, and oxytocin is mainly involved in uterine contractions during labour.
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About Reproductive Anatomy and Conception
Female and male reproductive organs, pelvic anatomy, gametogenesis, the menstrual cycle and the hormonal control of ovulation lead into fertilisation, implantation and early embryonic development. Questions distinguish ovulation from menstruation, fertilisation from implantation, and the normal anatomical changes that allow conception and pregnancy to occur.
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