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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
Explain the role of pituitary and the ovarian hormones in menstrual cycle in human females
Describe the changes that occur in ovaries and uterus in human female during the reproductive cycle.
Uterus, Parturition, Fertilisation, Gestation, Implantation.
Mention one significant difference between Hormones of ovulatory phase and hormones of luteal phase
Define the following term :
Ovulation
Choose the correct answer from the four options given below :
On which day of the menstrual cycle does ovulation take place ?
‘A proper understanding of the menstrual cycle can help immensely in family planning.’ Do you agree with the statement? Provide reasons for your answer.
Write the answers to the following questions by observing the figure below.
- What does the figure above show?
- Which organs are involved in this process?
- Which hormones are involved in this process?
- After how many days do these changes happen again?
- Explain your opinion about the statement that a woman's body is impure while the above process is going on.
Why menstrual cycle does not take place before puberty and during pregnancy?
The menstrual cycle ceases during pregnancy.
Which one of the following menstrual irregularities is correctly matched?
Explain the various phases of the menstrual cycle.
The following is the illustration of the sequence of ovarian events (a-i) in a human female.
Explain the changes that occur in the uterus simultaneously in anticipation.
During which phase of the menstrual cycle does the endometrium thicken up to 8-10 mm?
When does the following step take place?
Immediately after ovulation, the mammalian egg is covered by a membrane known as ______.
Ovulation in the human female normally takes place during the menstrual cycle ______.
Which one of the following events is correctly matched with the time period in a normal menstrual cycle?
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. |
If the peak of Hormone A does not appear in the study for Subject 1, which of the following statement is true?
Hormones responsible for menstrual cycle are produced from ______.
When does the corpus luteum degenerate?
Menstruation is triggered by an abrupt decline in the amount of ______.
Menstrual flow occurs due to lack of ______.
The menstrual cycle begins with ______
Identify the correct statement from the following:
Answer the following questions by observing the diagram of menstrual cycle:
- What is the period of menstruation?
- On which day does ovulation occur during the menstrual cycle?
- In the menstrual cycle which reproductive organs undergo changes?
- Which period is said to be the period of regeneration of endometrium?
- Which period is said to be the period of secretions of glands in endometrium?
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.
