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प्रश्न
Explain the events that occur in a graafian follicle at the time of ovulation and thereafter.
उत्तर
At the time of ovulation, the release of gonadotropins (LH and FSH) increases. The LH and FSH are at their peak in the middle of the cycle (14th day) and cause the rupture of the Graafian follicle to release the ovum. The remains of the Graafian follicle get converted to the corpus luteum, which secretes progesterone for the maintenance of the endometrium in case of pregnancy.
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संबंधित प्रश्न
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Define Amenorrhea
Explain menstrual cycle in human females.
Draw a neat and well-labeled diagram showing T.S. of the ovary and describe the menstrual cycle in human females.
Multiple Choice Question:
The onset of menstruation in the female is termed
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A biology student after studying the different levels of hormones during the menstrual cycle was comparing 2 subjects (Patients). A table was created after looking at the levels of hormones A and B for Subjects 1 and 2. Read the information in the table and answer the question that follows.
| HORMONE A | HORMONE B | |
| Subject 1 | Shows a peak on the 14th Day of the menstrual cycle. | Falls down during the luteal phase. |
| Subject 2 | Shows a peak on the 14th Day of the menstrual cycle. | The level is maintained high in the luteal phase. |
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- What is the period of menstruation?
- On which day does ovulation occur during the menstrual cycle?
- In the menstrual cycle which reproductive organs undergo changes?
- Which period is said to be the period of regeneration of endometrium?
- Which period is said to be the period of secretions of glands in endometrium?
Given below is the diagram depicting the menstrual cycle in human beings. Study it carefully and answer the questions that follow.
- Which phases are indicated by ‘C’ and ‘D’?
- Name the structures labelled ‘F’. What is its role?
- Explain the changes in the level of progesterone during phases ‘C’ and ‘D’.
- Which hormone present in the urine confirms pregnancy in human beings?
- Identify the structure labelled ‘E’. Name the hormone released by it.
