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प्रश्न
Read the following passage and answer the question that follows:
Rahini and her parents were watching a television programme. 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.
What is first menstruation called? When does it occur?
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उत्तर
The first menstruation is called Menarche. In human females, the menstrual cycle starts at the age of 11 – 13 years which marks the onset of puberty.
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संबंधित प्रश्न
Give appropriate biological or technical terms for the following:
The onset of menstruation in a young girl
Name the Following
The onset of menstruation in a young girl at about the age of 13 years.
State the names of four hormones which control menstrual cycle.
____________ is transformed to corpus luteum during luteal phase of the menstrual cycle.
The mammalian corpus luteum produces ______.
Corpus luteum develops from ______.
What are the events taking place in the ovary and uterus during follicular phase of the menstrual cycle.
Observe the figure and label it properly.
- Name the hormone that regulates the cycle.
- Name the phases in this cycle.
- What is the duration of ovulation phase?
- What happens if implantation occurs?
- What happens if implantation does not occur?
The figure show a section of human ovary. Select the option which gives the correct identification of either A or B with function/characteristic.
The onset of menstruation in women is called ______.
