Advertisements
Advertisements
Question
Which hormones regulate menstrual cycle?
Advertisements
Solution
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.
APPEARS IN
RELATED QUESTIONS
Identify True/False statement. Correct false statement to make it true.
Menstrual cycle ceases during pregnancy.
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
Differentiate between the following pair:
Menarche and menopause
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.
Choose the correct answer from the four options given below :
On which day of the menstrual cycle does ovulation take place ?
Explain the menstruation phases in the menstrual cycle of a human female.
Name the Following
The term used when females stop menstruation at the age of 45-50 years.
Follicle stimulating hormone : Development of oocyte : : Luteinizing hormone : ____________
Why menstrual cycle does not take place before puberty and during pregnancy?
The menstrual cycle ceases during pregnancy.
Expand the acronym.
FSH
Progesterone peaks during which phase of the menstrual cycle?
Match the Columns.
| Column I | Column II | ||
| i. | Proliferative phase | a. | Breakdown of the endometrial lining |
| ii. | Secretory phase | b. | Follicular phase |
| iii. | Menstruation | c. | Luteal phase |
How long does the secretory phase of the menstrual cycle last?
When does the following step take place?
Calculate the expected date of ovulation, if in a normal menstruating woman, gets her menses on 5th April.
Identify the INCORRECT statement.
Which set is similar?
Proliferative phase of menstrual cycle, is also called ______.
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:
Which of the following events is not associated with ovulation in human females?
The level of progesterone is high at which phase in the menstrual cycle?
Spermatogenesis is induced by ______.
The graph given below shows the number of primordial follicles per ovary in women at different ages. Study the graph and answer the questions that follow.
- What is the average age of the women at the onset of menopause?
- At what age are maximum primordial follicles present in the ovary, according to the given graph?
Name these:
4 phases of the menstrual cycle.
