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:
- What happens if less oxygen is absorbed in blood?
- What makes heart sound like lub?
- How many chemicals are used in tobacco smoke?
- What happens in small intestine?
- What are vitamins and functions?
- What happens to glucose in liver?