6.7 mechanism of breathing Flashcards
1
Q
what are the 2 sets of intercostal muscles?
A
- internal intercostal muscles
- external intercostal muscles
2
Q
inspiration
A
- ribs are pulled upwards and outwards
- increase volume of thorax
- diaphragm flatters
- increase in volume of thorax
- pressure reduced
- atmospheric pressure> pulmonary pressure
- EIM contract, IIM relax
3
Q
expiration
A
- ribs move downwards and inwards
- decrease volume of thorax
- diaphragm relaxes
- decreases volume of thorax
- atmospheric pressure< pulmonary pressure
- EIM relax, IIM contract
4
Q
pulmonary ventilation rate
A
tidal volume X breathing rate
5
Q
what is inspiration?
A
inhalation- breathing in
6
Q
what is expiration?
A
exhalation- breathing out
