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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
Why is follicular phase in the menstrual cycle also referred as proliferative phase? Explain.
Draw a graafian follicle and label antrum and secondary oocyte.
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.
Give Reasons
Missing of menses is the first indication of pregnancy.
Give Reasons
The chances of pregnancy to occur are most favourable on or about the 14th day of the menstrual cycle. Explain.
Describe the structure of a Graafian follicle.
The luteal phase of the menstrual cycle is also called the secretory phase. Give reason.
Which one of the following menstrual irregularities is correctly matched?
The following is the illustration of the sequence of ovarian events (a-i) in a human female.
Name the ovarian hormone and the pituitary hormone that have caused the above-mentioned events.
Identify the phase of the menstrual cycle during which there is a peak in the level of progesterone.
The life of corpus luteum is generally about ______ days in the absence of pregnancy
Calculate the number of spermatozoa produced by a single primary spermatocyte.
Identify the INCORRECT statement.
On the fourteenth day of the menstrual cycle the female gamete released is _____.
Corpus luteum develops under the influence of ______.
Withdrawal of which of the following hormones is the immediate cause of menstruation?
Which one of the following statements is incorrect about menstruation?
The endometrium in the female is the lining of ______.
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:
Menstruation is triggered by an abrupt decline in the amount of ______.
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.
Describe hormonal control in various phases of the menstrual cycle.
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 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?
Write a short note on Proliferative Phase.
The onset of menstruation in a human female is called ______.
The first menstruation is called ______.
Longest phase of menstrual cycle is ______.
