7. Describe the process of breathing in humans.
ans) In humans breathing takes place in two steps. i) Inhalation and ii) exhalation. The process of breathing in air is called inhalation and the process of breathing out air is called exhalation.
> During inhalation the chest and lungs expands, diaphragm moves down and air enters in through nose.
> During exhalation the chest and lungs shrinks, diaphragm moves upward and air moves out through nose.
8. Describe how deep breathing is carried out in Yoga.
ans) i) Sit comfortably on floor by folding your legs.
ii) Take a deep breath and expand your chest and lungs.
iii) Hold your breath for a few seconds and breathe out slowly
iv) Repeat this for few minutes
9. List two causes of air pollution and their effect on living things.
| Causes | Effects |
|---|---|
| 1. Smoke from vehicles | a. Breathing problems and lung diseases |
| 2. Smoke from factories and industries | b. Breathing problems, lung diseases and acid rain |
Homework
Practice to draw human respiratory system