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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.
the Biological/technical term for Complete stoppage of menstrual cycle in females
the biological/technical terms for Fixing of developing zygote on the uterine wall.
Give a significant point of difference between the oestrous and menstrual cycles.
Define Amenorrhea
Define the following term :
Ovulation
Explain the ovarian and uterine events that occur during a menstrual cycle in a human female under the influence of pituitary and ovarian hormones respectively.
Choose the correct answer from the four options given below :
On which day of the menstrual cycle does ovulation take place ?
Explain the changes that occur in the ovary and uterus during menstrual cycle in human females. Mention the influence of pituitary and ovarian hormones in bringing these changes.
Give Reasons
The chances of pregnancy to occur are most favourable on or about the 14th day of the menstrual cycle. Explain.
Name the Following
Sloughing of the uterine wall during menstrual flow.
Painful menstruation is termed as ____________.
The mammalian corpus luteum produces ______.
Ovulation in the human female normally takes place during the menstrual cycle ______.
Withdrawal of which of the following hormones is the immediate cause of menstruation?
Menstruation is triggered by a sudden decline in the amount of hormone secreted by corpus luteum. Identify the hormone.
Corpus luteum ______.
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?
In case the ova does not fertilize, which of the following events will take place?
Distinguish between pollination and fertilisation. Mention the site and product of fertilisation in a flower.
Draw a neat, labelled diagram of a pistil showing pollen tube growth and its entry into the ovule.
Menstrual flow occurs due to lack of ______.
The secretory phase in the human menstrual cycle is also called:
After ovulation the collapsed ovarian follicle shrinks and becomes filled with cell to form:
The menstrual cycle begins with ______
Why are menstrual cycles absent during pregnancy?
What role does pituitary gonadotropins play during follicular and ovulatory phases of menstrual cycle? Explain the shifts in steroidal secretions.
Which of the following statement is correct?
Name the following:
The permanent stoppage of menstruation in human females around the age of 45 years.
Choose the odd one out from the following terms and name the category to which the others belong:
Name these:
4 phases of the menstrual cycle.
