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Question
Why menstrual cycle does not take place before puberty and during pregnancy?
Solution
The reproducing period of a women’s life starts and becomes functional and an increase in sex hormone production starts only in puberty. So the menstrual cycle does not take place before puberty. The release of a mature egg, maintains the lining of the uterus, during pregnancy. During pregnancy, the placenta produces progesterone. This maintains the lining of the uterus during pregnancy and means that menstruation does not happen.
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RELATED QUESTIONS
Observe the figure and answer the questions given below.
a) What does the above figure indicate?
b) Which human organs are involved in this process?
c) Name the hormones responsible for this process.
d) After how many days these repetitive changes take place?
e) ‚A woman should stay away from others, as her body is impure during this process.‛ What is your opinion about this statement? Elaborate it.
Multiple choice question.
Rupturing of follicles and discharge of ova is known as _______.
Progesterone peaks during which phase of the menstrual cycle?
The correct sequence of hormone secretion from the beginning of menstruation is ______.
Withdrawal of which of the following hormones is the immediate cause of menstruation?
Corpus luteum ______.
Define ovulation.
Why are menstrual cycles absent during pregnancy?
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.
Name the following:
Two layers of the wall of uterus.
