Q1.
But I wonder why these changes occur at this stage of life!
Answer
Because of hormones — certain chemicals produced in our bodies.
Signal from the brain
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Different parts of the body produce hormones
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Hormones are released at the appropriate time
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Growth, puberty, menstruation, mood and behaviour are regulated
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Different parts of the body produce hormones
↓
Hormones are released at the appropriate time
↓
Growth, puberty, menstruation, mood and behaviour are regulated
Hormones play a crucial role in regulating various aspects of growth and development and in the proper functioning of the body. They are produced in different parts of the body and are released at an appropriate time in response to signals from the brain. Many changes of adolescence — including menstruation and the other signs of puberty — are mainly due to them, and some hormones influence mood and behaviour as well.
Why now and not earlier: the brain begins sending these signals only when the body is ready to prepare for adulthood — generally around 10 years of age. That is also why the changes do not begin on the same birthday for everybody: each body follows its own timetable.
Tip: Knowing that hormones are behind both the physical changes and the mood swings makes adolescence much easier to handle. By staying informed, seeking support and guidance when needed, and making healthy decisions, you build a strong foundation for the life ahead.