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प्रश्न
Why menstrual cycle does not take place before puberty and during pregnancy?
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उत्तर
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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संबंधित प्रश्न
Draw a graafian follicle and label antrum and secondary oocyte.
The Graafian follicle, after ovulation turns into a hormone producing issue called Corpus callosum.
Define the following term :
Ovulation
Explain the role of hormones during the menstrual cycle.
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.
Menstruation is triggered by a sudden decline in the amount of hormone secreted by corpus luteum. Identify the hormone.
Level of which hormones are at their highest during the luteal phase (second half of the cycle) of the menstrual cycle?
Distinguish between pollination and fertilisation. Mention the site and product of fertilisation in a flower.
Draw a neat, labelled diagram of a pistil showing pollen tube growth and its entry into the ovule.
In the figure given below, parts A and B show the level of hormones which influence the menstrual cycle. Study the figure and answer the questions that follow:
- Name the organs which secrete the hormones represented in parts A and B.
- State the impact of the hormones in part B on the uterus of the human female during 6 to 15 days of the menstrual cycle.
In the human menstrual cycle, the ovulation occurs around ______.
