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.
- How can large molecules pass through digestive tract?
- Which muscles make our chest move?
- What is major component of respiration?
- What happens after exchange of substances?
- Why is hemophilia dangerous?
- What is main job of white blood cells?