Topic: Food Energy and Respiration Subtopic: Introduction
How does air enter our lungs?
Answer: When we exhale, there is a pressure difference inside and outside of the lungs. To maintain that pressure air enters the lungs.
Learn also:
- Why we should not breathe through mouth?
- What causes smoker to cough?
- What happens if excess juice is secreted in stomach?
- Why is heart useful?
- How many types of pollination are there?
- How is food absorbed?