Topic: Food Energy and Respiration Subtopic: Making the air moist, warm and clean
Why we should not breathe through mouth?
Answer: Mouth does not contain mucus, blood vessels near the surface or hair that could trap the dust particles or germs.
- How does air reach blood vessels?
- What is meant by leaking of heart valves?
- How minerals salts are taken up?
- What happens to food in stomach?
- What are companion cells?
- Why is it better to breathe through nose?