Ventilation

Ventilation

Air moves in and out of lungs as a result of pressure changes in the chest cavity (thorax) by breathing movements.

Ventilation is the mechanisim of breathing.

Inspiration (taking air in)

*Requires energy

Diaghram: contrats, flattening and lowering

External costal muscle: contracts so Ribs: move upwards and ouwards

Volume increases ( elastic fibers of the alveoli strech)…