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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
the Biological/technical term for Complete stoppage of menstrual cycle in females
Explain menstrual cycle in human females.
Give appropriate biological or technical terms for the following:
The onset of menstruation in a young girl
Observe the figure and answer the questions given below.
a) What does the above figure indicate?
b) Which human organs are involved in this process?
c) Name the hormones responsible for this process.
d) After how many days these repetitive changes take place?
e) ‚A woman should stay away from others, as her body is impure during this process.‛ What is your opinion about this statement? Elaborate it.
Draw a neat and well-labeled diagram showing T.S. of the ovary and describe the menstrual cycle in human females.
Define: Menarche
Give Technical Term:
The phase in the menstrual cycle in which the remnant of a follicle in the ovary turns to corpus luteum.
How many pairs of testis are present in human male?
Describe the structure of a Graafian follicle.
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 following is the illustration of the sequence of ovarian events (a-i) in a human female.
Name the ovarian hormone and the pituitary hormone that have caused the above-mentioned events.
The life of corpus luteum is generally about ______ days in the absence of pregnancy
In humans, the menstrual cycle is generally of ______.
How long does the secretory phase of the menstrual cycle last?
Luteal phase is also known as ____________.
The correct sequence of hormone secretion from the beginning of menstruation is ______.
Immediately after ovulation, the mammalian egg is covered by a membrane known as ______.
The mammalian corpus luteum produces ______.
Corpus luteum ______.
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. |
The peak observed in Subject 1 and 2 is due to ______
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?
In case the ova does not fertilize, which of the following events will take place?
Menstrual flow occurs due to lack of ______.
Identify the correct statement from the following:
Mention the importance of LH surge during menstrual cycle.
What role does pituitary gonadotropins play during follicular and ovulatory phases of menstrual cycle? Explain the shifts in steroidal secretions.
Given below is a group of terms. In the group, one pair indicates the relationship between the two terms. Rewrite and complete the second pair on a similar basis.
Follicular phase: 5-12 days:: Luteal phase : ______ days.
Complete the following table by writing the name of the structure or the function of the given structure:
| Structure | Function | ||
| 1. | Corpus luteum | 1. | ______ |
| 2. | ______ | 2. | Produces male gametes in mass |
| 3. | Leydig cells | 3. | ______ |
| 4. | ______ | 4. | Stores the sperms until they mature and become mobile |
| 5. | Umbilical cord | 5. | ______ |
| 6. | Fallopian tube | 6. | ______ |
