Ventilation Flashcards
1
Q
Inspiration
A
External intercostal muscles & diaphragm contracts
Rib cage moves up and outwards and diaphragms flatten.
Increase volume of thoratic cavity
As volume increases, lung pressure decreases
Pressure gradient!
Air moves from higher atomospheric pressure outside lung into the lungs
ACTIVE PROCESS- NEEDS ENERGY
2
Q
Expiration
A
The external intercostal muscles relax and diapghram relax. The ribcage gies down and inwards Nd becomes curved.
The volume of the thoratic cavity decreases. Pressure increase and air is forced out.
3
Q
Forced expiration
A
External intercostalal muscles relax & internal intervostal muslces contact pulling ribcage further down and in. Movement between two muscles is antagonistic
