1.2 - respiratory system Flashcards
1
Q
what does the respiratory system do?
A
It allows us to takes in oxygen to burn up and extract energy from food and to get oxygen for muscles. Releases carbon dioxide gas which is toxic to us
2
Q
what muscles are used for inspiration at rest?
A
- external intercostal muscles contract
- diaphragm contracts (flattens)
3
Q
what muscles are used for inspiration during exercise?
A
- external intercostal muscles contract
- diaphragm contracts (flattens)
- sternocleidomastoid and pectorals contracts, pulling rib cage upwards and outwards
- scalenes contract
4
Q
what muscles are used for expiration at rest?
A
expiration is passive, at rest, muscles simply relax
- external intercostal muscles relax
- diaphragm relaxes (domes)
5
Q
what muscles are used for expiration during exercise?
A
muscles contract to help push air out the lungs by decreasing their volume and increasing pressure
- internal intercostal muscles contract
- abdominals contract
- external intercostal muscles relax
- diaphragm relaxes (domes)
6
Q
what happens to the pressure and volume during respiration?
A
INSPIRATION
- pressure decreases, volume increases
EXPIRATION
-
