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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
Name and explain the role of the inner and middle walls of the human uterus.
Identify True/False statement. Correct false statement to make it true.
Menstrual cycle ceases during pregnancy.
Explain the events that occur in a graafian follicle at the time of ovulation and thereafter.
Give a significant point of difference between the oestrous and menstrual cycles.
Name the Following
The onset of menstruation in a young girl at about the age of 13 years.
Name the Following
Sloughing of the uterine wall during menstrual flow.
When does ovulatory phase occur?
Immediately after ovulation, the mammalian egg is covered by a membrane known as ______.
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.
The onset of menstruation in a human female is called ______.
