Ovulation in human female normally takes place during the menstruation cycle :

Options

A. At the mid-secretory phase
B. At the end of proliferative phase
C. Just before the end of the secretory phase
D. At the begining of proliferative phase

Answer

To determine when ovulation occurs in the human female menstrual cycle, we can break down the menstrual cycle into its four main phases and identify the timing of ovulation within these phases.

### Step-by-Step Solution:

1. **Understand the Phases of the Menstrual Cycle**:
- The menstrual cycle consists of four main phases:
- Menstrual Phase
- Proliferative Phase
- Ovulation Phase
- Luteal (or Secretory) Phase

2. **Identify the Menstrual Phase**:
- The menstrual phase is characterized by bleeding and lasts for about 3 to 5 days. This is when the endometrial lining is shed.

3. **Recognize the Proliferative Phase**:
- Following the menstrual phase, the proliferative phase occurs, which lasts from day 6 to day 13. This phase involves the healing and thickening of the endometrial lining as it prepares for a potential pregnancy.

4. **Locate the Ovulation Phase**:
- Ovulation typically occurs around day 14 of a 28-day cycle. This is when a mature ovum is released from the ovary. The ovulation phase is marked by a peak in Luteinizing Hormone (LH), which triggers the release of the ovum.

5. **Understand the Luteal Phase**:
- After ovulation, the luteal phase begins, lasting from day 15 to day 28. During this phase, the endometrial lining continues to thicken and prepare for implantation of a fertilized egg.

6. **Conclusion**:
- Based on the timing of these phases, ovulation occurs at the end of the proliferative phase, specifically around day 14 of the menstrual cycle.

### Final Answer:
Ovulation in the human female normally takes place at the end of the proliferative phase of the menstrual cycle.