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प्रश्न
Which hormones regulate menstrual cycle?
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उत्तर
The menstrual cycle is regulated by a complex interplay of hormones such as follicle-stimulating hormone (FSH), luteinising hormone (LH), estrogen, and progesterone. During the follicular phase, levels of FSH and LH secreted from the anterior pituitary begin to rise. FSH, guided by gonadotropin-releasing hormone (GnRH) from the hypothalamus, helps primary follicles grow into Graafian follicles.
As the follicle matures, it begins to secrete estrogen, which leads to the proliferation of the endometrial lining of the uterus. Estrogen also provides positive feedback to stimulate the surge of LH this LH surge causes ovulation, i.e., the rupture of the Graafian follicle and release of the ovum.
The ruptured follicle transforms into the corpus luteum, which secretes progesterone during the luteal phase. Progesterone helps in maintaining the endometrium and preparing it for possible implantation of the embryo.
If fertilisation does not occur, progesterone levels drop, the corpus luteum degenerates, and the endometrium sheds, marking the onset of menstruation. High levels of progesterone also inhibit FSH and LH, thereby preventing further ovulation in that cycle.
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संबंधित प्रश्न
Uterus, Parturition, Fertilisation, Gestation, Implantation.
Mention one significant difference between Hormones of ovulatory phase and hormones of luteal phase
Give appropriate biological or technical terms for the following:
The onset of menstruation in a young girl
Give appropriate terms for each of the following process:
Fixing of developing zygote (blastocyst) on the uterine wall.
Explain the role of hormones during the menstrual cycle.
Explain the menstruation phases in the menstrual cycle of a human female.
Multiple Choice Question:
The onset of menstruation in the female is termed
What is the menstrual cycle?
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?
The luteal phase of the menstrual cycle is also called the secretory phase. Give reason.
The menstrual cycle ceases during pregnancy.
Progesterone peaks during which phase of the menstrual cycle?
In humans, the menstrual cycle is generally of ______.
If the corpus luteum is present in the ovary even after 72 hours after ovulationit indicates that ______.
All occur during follicular phase of menstrual cycle, EXCEPT
____________ is transformed to corpus luteum during luteal phase of the menstrual cycle.
Calculate the expected date of ovulation, if in a normal menstruating woman, gets her menses on 5th April.
Corpus luteum develops under the influence of ______.
Which one of the following is the most likely root cause why menstruation is not taking place in regularly cycling human female?
Mature Graafian follicle is generally present in the ovary of a healthy human female around stet ______.
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?
Define ovulation.
The secretory phase in the human menstrual cycle is also called:
A human female experiences two major changes, menarche and menopause during her life. Mention the significance of both the events.
What role does pituitary gonadotropins play during follicular and ovulatory phases of menstrual cycle? Explain the shifts in steroidal secretions.
Observe the figure and label it properly.
- Name the hormone that regulates the cycle.
- Name the phases in this cycle.
- What is the duration of ovulation phase?
- What happens if implantation occurs?
- What happens if implantation does not occur?
Describe hormonal control in various phases of the menstrual cycle.
The onset of menstruation in a human female is called ______.
Name the following:
Two layers of the wall of uterus.
