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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 role of pituitary and ovarian hormones during the menstrual cycle in a human female.
Explain the role of pituitary and the ovarian hormones in menstrual cycle in human females
Mention one significant difference between Hormones of ovulatory phase and hormones of luteal phase
Define Amenorrhea
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.
Give Reasons
Missing of menses is the first indication of pregnancy.
Meanrch, menstrual cycle, and menopause are controlled by ______.
State the names of four hormones which control menstrual cycle.
Why menstrual cycle does not take place before puberty and during pregnancy?
The luteal phase of the menstrual cycle is also called the secretory phase. Give reason.
The menstrual cycle ceases during pregnancy.
Find the wrongly matched pair.
Lack of which hormone results in menstrual flow?
How long does the secretory phase of the menstrual cycle last?
Which hormone is secreted by the developing secondary follicles?
When does the following step take place?
The correct sequence of hormone secretion from the beginning of menstruation is ______.
Mainly which type of hormones control the menstrual cycle in human beings?
Which one of the following is the correct matching of the events occurring during menstrual cycle?
Proliferative phase of menstrual cycle, is also called ______.
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. |
Subject 2 has a higher level of hormone B, which is ______
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.
Exit from the cell cycle and remain dormant for long time by a cell is represented by one of the following phases of the cell cycle:
Menstrual flow occurs due to lack of ______.
About which day in a normal human menstrual cycle does rapid secretion of LH (Popularly called LH Surge) normally occurs?
Give a reason for the following:
The second half of the menstrual cycle is called the luteal phase as well as the secretory phase.
The enlarged mature follicle bursts to release the egg.
Name these:
4 phases of the menstrual cycle.
Match Column I and Column II with respect to the menstrual cycle.
| Column I | Column II |
|---|---|
| i. Menstrual phase | c. Secretion of inhibin |
| ii. Follicular phase | b. Development of the primary follicle |
| iii. Ovulatory phase | a. Rapid secretion of LH |
| iv. Secretory phase | d. Secretion of estrogen |
Choose the correct option.
