Question

Ovulation in the human female normally takes place during the menstrual cycle

• A. Just before the end of the secretory phase
• B. At the mid of the secretory phase
• C. At the end of the proliferative phase
• D. At the beginning of the proliferative phase

Answer 1

The correct option is C

At the end of the proliferative phase

The correct option is C.

Explanation for Correct option:

1. Ovulation always occurs 14 days before menstruation; hence, ovulation occurs on day 14 of a 28-day cycle.
2. Because of follicular maturity and enhanced hormone production, 17-beta-estradiol levels are high at the end of the proliferative period.
3. The uterus develops a dense internal lining.
4. The uterus is reacting to the estrogen released by the follicles, rebuilding the lining that was just shed during the previous period, while the ovaries are focusing on producing the egg-containing follicles.

Explanation for Incorrect option:

Option A:

1. The corpus luteum produces plasma levels of 17-beta-estradiol and progesterone near the conclusion of the secretory phase.
2. A fertilized ovum is implanted within the endometrium if pregnancy occurs, and the corpus luteum persists and maintains hormone levels.

Option B:

1. The "secretory phase" is another name for the luteal phase.
2. This describes both the production of a clear fluid from the endometrium during this phase as well as the secretion of progesterone from the corpus luteum.

Option D:

1. Before ovulation, during the proliferative phase, the endometrium is rebuilt as a result of an increase in estrogen.
2. A surge in the hormone progesterone causes the endometrium to become receptive to egg implantation during the secretory phase, which starts at ovulation.

Final answer:

Ovulation in the human female normally takes place during the menstrual cycle at the end of the proliferative phase.