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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
How can the scientific understanding of the menstrual cycle of human females help as a contraceptive measure?
Draw a neat and well-labeled diagram showing T.S. of the ovary and describe the menstrual cycle in human females.
Multiple Choice Question:
The onset of menstruation in the female is termed
Explain the ovarian cycle with its different phases.
Read the following passage and answer the question that follows:
Rahini and her parents were watching a television programme. 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.
What is first menstruation called? When does it occur?
The menstrual cycle ceases during pregnancy.
Painful menstruation is termed as ____________.
Detection of which hormone in urine is an indicator of pregnancy?
Lack of which hormone results in menstrual flow?
Calculate the number of spermatozoa produced by a single primary spermatocyte.
Choose the correct order of phases of the menstrual cycle.
____________ is transformed to corpus luteum during luteal phase of the menstrual cycle.
Ovulation in the human female normally takes place during the menstrual cycle ______.
Mature Graafian follicle is generally present in the ovary of a healthy human female around stet ______.
Which one of the following statements is incorrect about menstruation?
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.
Menstruation normally occurs once in ______.
The Corpus luteum grows during menstruation.
When does the corpus luteum degenerate?
The secretory phase in the human menstrual cycle is also called:
The level of progesterone is high at which phase in the menstrual cycle?
Describe hormonal control in various phases of the menstrual cycle.
In the figure given below, parts A and B show the level of hormones which influence the menstrual cycle. Study the figure and answer the questions that follow:
- Name the organs which secrete the hormones represented in parts A and B.
- State the impact of the hormones in part B on the uterus of the human female during 6 to 15 days of the menstrual cycle.
Answer the following questions by observing the diagram of menstrual cycle:
- What is the period of menstruation?
- On which day does ovulation occur during the menstrual cycle?
- In the menstrual cycle which reproductive organs undergo changes?
- Which period is said to be the period of regeneration of endometrium?
- Which period is said to be the period of secretions of glands in endometrium?
Choose the odd one out from the following terms and name the category to which the others belong:
Name the following:
Two layers of the wall of uterus.
Name these:
4 phases of the menstrual cycle.
