Breathing in Humans Flashcards
1
Q
What is Inspiration?
A
It is an active process - requires energy
2
Q
How does expiration work?
A
- external intercostal and diaphragm muscles relax
- ribcage moves downwards and inwards, diaphragm becomes curved
- thorax volume decreases
- air pressure increases
- air is forced out of the lung
3
Q
What is expiration?
A
passive process - does not require energy
4
Q
How does inspiration work?
A
- external intercostal and diaphragm muscles contract
- ribcage moves upwards and outwards
- thorax volume increases
- air pressure decreases
- air is drawn into the lungs
