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प्रश्न
Why are menstrual cycles absent during pregnancy?
Menstrual cycles are absent during pregnancy. Why?
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उत्तर
The high levels of progesterone and estrogens during pregnancy suppress the gonadotropins which is required for the development of new follicles. Therefore, a new cycle cannot be initiated.
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संबंधित प्रश्न
Define the following term :
Ovulation
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 menstruation phases in the menstrual cycle of a human female.
Name the Following
Sloughing of the uterine wall during menstrual flow.
Complete the following sentences with appropriate word:
The human gestation period is about ____________.
Multiple choice question.
Rupturing of follicles and discharge of ova is known as _______.
Meanrch, menstrual cycle, and menopause are controlled by ______.
How many pairs of testis are present in human male?
Explain the ovarian cycle with its different phases.
Follicle stimulating hormone : Development of oocyte : : Luteinizing hormone : ____________
What is the menstrual cycle?
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?
In the absence of fertilization, corpus luteum ____________.
On the fourteenth day of the menstrual cycle the female gamete released is _____.
The correct sequence of hormone secretion from the beginning of menstruation is ______.
The mammalian corpus luteum produces ______.
Which one of the following is the most likely root cause why menstruation is not taking place in regularly cycling human female?
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. |
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?
Menstruation normally occurs once in ______.
After ovulation the collapsed ovarian follicle shrinks and becomes filled with cell to form:
Identify the correct statement from the following:
Give a reason for the following:
The second half of the menstrual cycle is called the luteal phase as well as the secretory phase.
Name the following:
Two layers of the wall of uterus.
The onset of menstruation in women is called ______.
In the human menstrual cycle, the ovulation occurs around ______.
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. | ______ |
