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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
Describe the changes that occur in ovaries and uterus in human female during the reproductive cycle.
Explain menstrual cycle in human females.
Give appropriate terms for each of the following process:
Fixing of developing zygote (blastocyst) on the uterine wall.
Sketch the labelled diagram.
Menstrual cycle
Explain the role of hormones during the menstrual cycle.
Give Reasons
The chances of pregnancy to occur are most favourable on or about the 14th day of the menstrual cycle. Explain.
Complete the following sentences with appropriate word:
The human gestation period is about ____________.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Menarche is the stoppage of menstruation.
Meanrch, menstrual cycle, and menopause are controlled by ______.
What is the menstrual cycle?
State the names of four hormones which control menstrual cycle.
Write the answers to the following questions by observing the figure below.
- What does the figure above show?
- Which organs are involved in this process?
- Which hormones are involved in this process?
- After how many days do these changes happen again?
- Explain your opinion about the statement that a woman's body is impure while the above process is going on.
Explain the importance of cleanliness during the time of menstrual cycle in girls.
What are the phases of the menstrual cycle? Indicate the changes in the ovary and uterus.
Find the wrongly matched pair.
Explain the various phases of the menstrual cycle.
Progesterone peaks during which phase of the menstrual cycle?
Which hormone is secreted by the developing secondary follicles?
Identify the INCORRECT statement.
The correct sequence of hormone secretion from the beginning of menstruation is ______.
Secretion of progesterone by corpus luteum is initiated by ______.
Corpus luteum develops from ______.
The endometrium in the female is the lining of ______.
When does the corpus luteum degenerate?
The growth of corpus luteum is initiated by:
A human female experiences two major changes, menarche and menopause during her life. Mention the significance of both the events.
The figure show a section of human ovary. Select the option which gives the correct identification of either A or B with function/characteristic.
Give a reason for the following:
The second half of the menstrual cycle is called the luteal phase as well as the secretory phase.
