Differentiate between inspiration and expiration during breathing process.
Q.25 Differentiate between inspiration and expiration during breathing process.
1 answer
Best answer
Answer:
| Inspiration | Expiration |
|---|---|
| Air (rich in O2) is drawn into the lungs. | Air (rich in CO2) is expelled from the lungs. |
| It is an active process. | Normal expiration is a passive process. |
| Diaphragm contracts and becomes flat. | Diaphragm relaxes and becomes dome-shaped. |
| External intercostal muscles contract; ribs and sternum move upwards and outwards. | External intercostal muscles relax (internal intercostals contract in forced expiration); ribs and sternum move downwards and inwards. |
| Volume of thoracic cavity and lungs increases. | Volume of thoracic cavity and lungs decreases. |
| Intrapulmonary pressure falls below atmospheric pressure, so air rushes in. | Intrapulmonary pressure rises above atmospheric pressure, so air is pushed out. |
Doubtly AI
· 28 Oct 2026
AI-verified · Oct 2026
Report
Was this answer helpful?
Thanks for the feedback.
Sign up free to save answers and ask your own doubts
Your answer
Log in or create a free account to answer this question.