Advertisements
Advertisements
प्रश्न
What is menstrual cycle? Describe it in brief.
उत्तर
The menstrual cycle is the reproductive cycle of all primates, which begins at youth (menarche).
-
Human females menstruate once every 28 to 29 days. The menstrual cycle refers to the order of events that occur between each menstruation.
-
In the middle of the menstrual cycle, one ovum is discharged (ovulation).
-
The menstrual cycle begins with the break down of the uterus endometrium, which lasts 3–5 days. Blood vessels in liquid form leave the body, however this only happens when the ovum is not fertilized.
-
It is followed by the follicular phase. During this phase, the main follicles develop into Graafian follicles. This leads to uterine regeneration, follicular growth, and the production of estrogen by the developing follicles.
-
During the 14th day of the cycle, the LH and FSH levels peak, leading to Graafian follicle rupture and ovulation. This phase is known as the ovulatory phase.
-
In the absence of fertilisation, the corpus luteum declines, resulting in endometrial break down and the beginning of a new cycle.
APPEARS IN
संबंधित प्रश्न
Describe the roles of pituitary and ovarian hormones during the menstrual cycle in a human female.
Why is follicular phase in the menstrual cycle also referred as proliferative phase? Explain.
Explain menstrual cycle in human females.
Explain the changes that occur in the ovary and uterus during menstrual cycle in human females. Mention the influence of pituitary and ovarian hormones in bringing these changes.
Define: Menarche
Explain the role of hormones during the menstrual cycle.
Name the Following
The term used when females stop menstruation at the age of 45-50 years.
Multiple Choice Question:
The onset of menstruation in the female is termed
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.
Detection of which hormone in urine is an indicator of pregnancy?
How long does the secretory phase of the menstrual cycle last?
Luteal phase is also known as ____________.
The mammalian corpus luteum produces ______.
Level of which hormones are at their highest during the luteal phase (second half of the cycle) of the menstrual cycle?
Corpus luteum ______.
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. |
Which of the following statements is true about the subjects?
The main function of mammalian corpus luteum is to produce ______.
Describe hormonal control in various phases of the menstrual cycle.
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?
