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प्रश्न
What are the phases of the menstrual cycle? Indicate the changes in the ovary and uterus.
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उत्तर
The four phases of the menstrual cycle are:
- Menstrual or Destructive phase
- Follicular or Proliferative phase
- Ovulatory phase
- Luteal or secretory phase.
Events of the menstrual cycle and changes in the ovary and changes in the uterus.
| Phase | Days | Changes in Ovary | Changes in Uterus | Hormonal changes |
| Menstrual phase | 4 – 5 days | Development of primary follicles. | Breakdown of uterine endometrial lining leads to bleeding. | The decrease in progesterone and estrogen. |
| Follicular phase | 6th – 13th day |
Primary follicles grow to become fully mature Graafian follicles. | Endometrium regenerates through proliferation. | FSH and Oestrogen increase. |
| Ovulatory phase | 14th day | The Graafian follicle ruptures, and releases the ovum (egg). | Increase in endometrial thickness. | LH peak. |
| Luteal phase | 15th – 28th day | Emptied Graafian follicle develops into corpus luteum. | The endometrium is prepared for implantation if fertilization of the egg takes place if fertilization does not occur corpus luteum degenerates, uterine wall ruptures, bleeding starts, an unfertilized egg is expelled. | LH and FSH decrease, Corpus luteum produces progesterone, and its level increases followed by a decline if menstrual bleeding occurs. |
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संबंधित प्रश्न
Name the function of the following:
Corpus luteum
Multiple choice question.
Rupturing of follicles and discharge of ova is known as _______.
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.
Do you think that Rahini’s objection towards her parents was correct? If so, Why?
Which one of the following is the correct matching of the events occurring during menstrual cycle?
Which one of the following is the most likely root cause why menstruation is not taking place in regularly cycling human female?
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 ______
The Corpus luteum grows during menstruation.
Menstruation is triggered by an abrupt decline in the amount of ______.
The level of progesterone is high at which phase in the menstrual cycle?
The figure show a section of human ovary. Select the option which gives the correct identification of either A or B with function/characteristic.
