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Ovulation in the human female normally t...

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

A

at the mid scretory phase

B

just before the end of the secretory phase

C

at the beginning of the proliferative phase

D

at the end of the proliferative phase.

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The correct Answer is:
### Step-by-Step Solution: 1. **Understanding the Menstrual Cycle**: - The menstrual cycle in human females typically lasts about 28 days and is divided into four distinct phases. 2. **Phases of the Menstrual Cycle**: - **Menstrual Phase**: This is the first phase, lasting approximately 1 to 5 days, during which the endometrial lining is shed if fertilization does not occur. - **Proliferative Phase**: Following menstruation, this phase lasts from about day 6 to day 13. During this time, the endometrial lining of the uterus regenerates and thickens in preparation for a potential pregnancy. - **Ovulatory Phase**: This phase occurs around day 14 of the menstrual cycle. It is characterized by the release of an ovum (egg) from the ovary, which is known as ovulation. - **Luteal (Secretory) Phase**: After ovulation, this phase lasts from day 15 to day 28. The corpus luteum forms and secretes progesterone, which is crucial for maintaining the uterine lining for a potential pregnancy. 3. **Timing of Ovulation**: - Ovulation typically occurs on the 14th day of the menstrual cycle, marking the transition from the proliferative phase to the luteal phase. 4. **Conclusion**: - Therefore, ovulation occurs at the end of the proliferative phase, specifically on the 14th day of the menstrual cycle. ### Final Answer: Ovulation in the human female normally takes place on the 14th day of the menstrual cycle, at the end of the proliferative phase. ---
### Step-by-Step Solution: 1. **Understanding the Menstrual Cycle**: - The menstrual cycle in human females typically lasts about 28 days and is divided into four distinct phases. 2. **Phases of the Menstrual Cycle**: - **Menstrual Phase**: This is the first phase, lasting approximately 1 to 5 days, during which the endometrial lining is shed if fertilization does not occur. - **Proliferative Phase**: Following menstruation, this phase lasts from about day 6 to day 13. During this time, the endometrial lining of the uterus regenerates and thickens in preparation for a potential pregnancy. ...
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