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.
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- What is circulatory system?
- How is pulse detected?
- What are some major causes of asthma?
- How are atria and ventricles separated?
- Which blood vessel carries blood and where?
- What happens if excess juice is secreted in stomach?