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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 menstrual phase in a human female. State the levels of ovarian and pituitary hormones during this phase.
Describe the changes that occur in ovaries and uterus in human female during the reproductive cycle.
The Graafian follicle, after ovulation turns into a hormone producing issue called Corpus callosum.
the biological/technical terms for Fixing of developing zygote on the uterine wall.
Define Amenorrhea
Give appropriate terms for each of the following process:
Fixing of developing zygote (blastocyst) on the uterine wall.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Menarche is the stoppage of menstruation.
Describe the phases of the menstrual cycle and their hormonal control.
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?
Painful menstruation is termed as ____________.
Which one of the following menstrual irregularities is correctly matched?
Explain the various phases of the menstrual cycle.
Detection of which hormone in urine is an indicator of pregnancy?
Identify the phase of the menstrual cycle during which there is a peak in the level of progesterone.
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?
All occur during follicular phase of menstrual cycle, EXCEPT
Corpus luteum produces ______.
Withdrawal of which of the following hormones is the immediate cause of menstruation?
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?
Menstruation normally occurs once in ______.
Given below is a flow chart showing ovarian changes during menstrual cycle. Fill in the spaces giving the name of the hormones responsible for the events shown.
Spermatogenesis is induced by ______.
Write a short note on Secretory Phase.
Given below is the diagram depicting the menstrual cycle in human beings. Study it carefully and answer the questions that follow.
- Which phases are indicated by ‘C’ and ‘D’?
- Name the structures labelled ‘F’. What is its role?
- Explain the changes in the level of progesterone during phases ‘C’ and ‘D’.
- Which hormone present in the urine confirms pregnancy in human beings?
- Identify the structure labelled ‘E’. Name the hormone released by it.
The egg is passed down through the oviduct by muscular contractions.
Name these:
4 phases of the menstrual cycle.
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.
