Menstruation does not occur if the:
Correct answer: D. Egg is fertilized
- A. Uterine lining thickens
- B. Estrogen level falls
- C. Progesterone level falls
- D. Egg is fertilized
Explanation
If the egg is fertilized, it implants itself into the uterine lining, which becomes thicker and more vascularized to support the growing embryo. In this case, menstruation doesn't occur because the fertilized egg signals the body to maintain the uterine lining for pregnancy.
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Human reproduction covers the male and female reproductive organs, gamete formation, fertilization, implantation and hormonal regulation. The menstrual cycle includes ovarian and uterine changes controlled by pituitary and ovarian hormones, while sexually transmitted diseases are studied through their causes, transmission, symptoms, prevention and effects on fertility.
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