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प्रश्न
What is menstrual cycle?
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उत्तर
The menstrual cycle is the cyclic change of the reproductive tract of a primate female. This period is marked by a characteristic event repeated almost every month (28 days with minor variation) in the form of a menstrual flow (i.e., shedding of the endometrium of the uterus with bleeding). Only during pregnancy does it temporarily cease.
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संबंधित प्रश्न
Draw a graafian follicle and label antrum and secondary oocyte.
Give a significant point of difference between the oestrous and menstrual cycles.
Multiple Choice Question:
The onset of menstruation in the female is termed
Read the following passage and answer the question that follows:
Rahini and her parents were watching a television program. An advertisement flashed on the screen which was promoting the use of sanitary napkins. Rahini’s parents suddenly changed the channel, but she objected to her parents and explained the need and importance of such an advertisement.
List out the napkin hygiene measures taken during menstruation?
What are the phases of the menstrual cycle? Indicate the changes in the ovary and uterus.
The menstrual cycle ceases during pregnancy.
Explain the various phases of the menstrual cycle.
If the corpus luteum is present in the ovary even after 72 hours after ovulationit indicates that ______.
Menstruation begins due to ______.
When does ovulatory phase occur?
Calculate the expected date of ovulation, if in a normal menstruating woman, gets her menses on 5th April.
Which one of the following statements is incorrect about menstruation?
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. |
For subject 2 it is observed that the peak for hormone B has reached the plateau stage. After approximately how much time will the curve for hormone B descend?
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. |
Which of the following statements is true about the subjects?
Exit from the cell cycle and remain dormant for long time by a cell is represented by one of the following phases of the cell cycle:
Menstrual flow occurs due to lack of ______.
The growth of corpus luteum is initiated by:
At which stage of the menstrual cycle, both LH and FSH are high?
The level of progesterone is high at which phase in the menstrual cycle?
A human female experiences two major changes, menarche and menopause during her life. Mention the significance of both the events.
The graph given below shows the number of primordial follicles per ovary in women at different ages. Study the graph and answer the questions that follow.
- What is the average age of the women at the onset of menopause?
- At what age are maximum primordial follicles present in the ovary, according to the given graph?
Write a short note on Secretory Phase.
Name the following:
The permanent stoppage of menstruation in human females around the age of 45 years.
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.
The onset of menstruation in a human female is called ______.
In the human menstrual cycle, the ovulation occurs around ______.
The first menstruation is called ______.
What hormone types control the menstrual cycle?
