Question

Which phase of the menstrual cycle is also known as the proliferative phase?

• A. Menstrual phase
• B. Secretory phase
• C. Follicular phase
• D. Ovulatory phase

Hint:

Remember the synchronization between ovarian and uterine cycles:
- Follicular phase \(\leftrightarrow\) Proliferative phase (estrogen-driven endometrial growth).
- Ovulatory phase \(\leftrightarrow\) Ovulation.
- Luteal phase \(\leftrightarrow\) Secretory phase (progesterone-driven endometrial thickening and secretion).

Answer 1

The Correct Option is C

Step 1: Understanding the Question:
The question asks for an alternative name for the proliferative phase of the human menstrual cycle.

Step 3: Detailed Explanation:
The menstrual cycle can be divided into ovarian phases (follicular, ovulatory, luteal) and uterine phases (menstrual, proliferative, secretory).
Follicular phase (Ovarian phase): This phase begins on the first day of menstruation and lasts until ovulation. During this time, follicles in the ovary mature.
Proliferative phase (Uterine phase): This phase occurs concurrently with the follicular phase. After menstruation, the uterine endometrium starts to rebuild and thicken (proliferate) in response to increasing estrogen levels produced by the developing ovarian follicles. This preparation is for a potential pregnancy.
Menstrual phase: This is the shedding of the uterine lining (menstruation).
Ovulatory phase: The short phase around ovulation when the egg is released.
Secretory phase (Uterine phase) Luteal phase (Ovarian phase): This phase occurs after ovulation, where the endometrium becomes secretory in response to progesterone from the corpus luteum, preparing for implantation.
Therefore, the follicular phase is concurrent with the proliferative phase, and often, the terms are used interchangeably when referring to the period of endometrial growth. In common terminology, the follicular phase is linked to the proliferative phase.

Step 4: Final Answer:
The follicular phase of the menstrual cycle is also known as the proliferative phase.