REACHING THE AGE OF ADOLESCENCE | Class 8 Science Notes

Physical Changes at Adolescence

During adolescence, the human body undergoes several physical changes that are visible and measurable. These changes include an increase in height and weight, changes in body shape, and the development of secondary sexual characteristics. The growth spurt is a rapid increase in height and weight that occurs due to the increased activity of growth hormones. Boys generally experience this growth spurt a little later than girls but tend to grow taller and heavier. The body shape changes as muscle mass increases in boys, and fat distribution changes in girls, leading to a more rounded body shape. Secondary sexual characteristics are features that distinguish males and females but are not directly involved in reproduction. In boys, these include the growth of facial and body hair, deepening of the voice, and broadening of shoulders. In girls, breast development and the start of menstruation are key changes. These physical changes are accompanied by internal changes in the reproductive organs, which mature and become functional. The skin may also become oily, and acne may develop due to increased activity of sebaceous glands. These changes are natural and signify the body's preparation for adulthood.

📊 Diagram: Illustrations showing the physical changes in boys and girls during adolescence, including height increase, development of facial hair in boys, and breast development in girls. Also shows changes in body shape and skin condition.

🧪 Activity: No specific activity in this section.

🔗 Connection: Prepares for the next section explaining the role of hormones in these physical changes.