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प्रश्न
A human female experiences two major changes, menarche and menopause during her life. Mention the significance of both the events.
Women experiences two major events in their life time one at menarche and the second at menopause. Mention the characteristics of both the events.
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उत्तर
Menarche:
- It is the first menstrual flow in a girl’s life.
- Occurs between age 11 to 13 years.
- Marks the beginning of reproductive phase.
- Indicates onset of puberty and ovulation begins.
Menopause:
- It is the permanent cessation of menstrual cycles.
- Occurs between age 45 to 50 years.
- Ovarian follicles stop responding to pituitary hormones.
- Ovulation and menstruation cease; fertility ends.
- Estrogen levels fall, causing physical and psychological changes.
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संबंधित प्रश्न
Explain the menstrual phase in a human female. State the levels of ovarian and pituitary hormones during this phase.
Describe the role of pituitary and ovarian hormones during the menstrual cycle in a human female.
Identify True/False statement. Correct false statement to make it true.
Menstrual cycle ceases during pregnancy.
Why is follicular phase in the menstrual cycle also referred as proliferative phase? Explain.
the biological/technical terms for Fixing of developing zygote on the uterine wall.
Define the following term :
Ovulation
Give Reasons
The chances of pregnancy to occur are most favourable on or about the 14th day of the menstrual cycle. Explain.
Explain the importance of cleanliness during the time of menstrual cycle in girls.
Which one of the following menstrual irregularities is correctly matched?
During which phase of the menstrual cycle does the endometrium thicken up to 8-10 mm?
Identify the phase of the menstrual cycle during which there is a peak in the level of progesterone.
Which one of the following events occurs during the secretory phase of the menstrual cycle?
In humans, the menstrual cycle is generally of ______.
All occur during follicular phase of menstrual cycle, EXCEPT
Identify the INCORRECT statement.
The mammalian corpus luteum produces ______.
Which one of the following is the correct matching of the events occurring during menstrual cycle?
Level of which hormones are at their highest during the luteal phase (second half of the cycle) of the menstrual cycle?
A human female reaches menopause aroung the age of ______.
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. |
The peak observed in Subject 1 and 2 is due to ______
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?
Hormones responsible for menstrual cycle are produced from ______.
The main function of mammalian corpus luteum is to produce ______.
The level of progesterone is high at which phase in the menstrual cycle?
Identify the correct statement from the following:
Given below is a flow chart showing ovarian changes during menstrual cycle. Fill in the spaces giving the name of the hormones responsible for the events shown.
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?
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.
In the human menstrual cycle, the ovulation occurs around ______.
