Question

Menstrual flow occurs due to lack of

• A. Progesterone
• B. FSH
• C. Oxytocin
• D. Vasopressin

Answer 1

The Correct Option is A

To understand why menstrual flow occurs due to the lack of Progesterone, it's essential to explore the menstrual cycle briefly.

The menstrual cycle involves several hormonal changes, and the coordination of four main hormones plays a critical role:

1. Follicle Stimulating Hormone (FSH): It stimulates the growth of ovarian follicles in the ovary before the release of an egg.
2. Luteinizing Hormone (LH): It triggers ovulation and helps form the corpus luteum.
3. Estrogen: Primarily responsible for the build-up of the uterine lining.
4. Progesterone: Produced by the corpus luteum, it maintains the uterine lining for potential implantation of a fertilized egg.

After ovulation, the corpus luteum in the ovary secretes progesterone. If no fertilization occurs, the corpus luteum degenerates, leading to a decrease in progesterone levels. This drop in progesterone causes the breakdown of the endometrial lining, resulting in menstrual flow.

Let's analyze the given options:

• Progesterone: Correct answer. The lack of progesterone leads to the breakdown of the endometrial lining and initiation of menstrual flow.
• FSH (Follicle Stimulating Hormone): Primarily responsible for the stimulation of ovarian follicle growth, not directly linked to menstrual flow.
• Oxytocin: Known as the "love hormone," it induces labor contractions and milk ejection, not involved in menstrual flow.
• Vasopressin: Involved in water retention by kidneys and blood pressure regulation, not related to the menstrual cycle.

Hence, the correct answer is Progesterone, as its lack leads to menstrual flow.