Ventilation and Spirometers

During inhalation...
Intercostal muscles contract relax( contract, relax ) and move out in( out, in ).
The diaphragm contracts relaxes( contracts, relaxes ) and moves down up( down, up ).
The volume in the lungs increases decreases( increases, decreases ) and the air pressure in the lungs decreases increases( decreases, increases ).

During exhalation...
Intercostal muscles contract relax( contract, relax ) and move out in( out, in ).
The diaphragm contracts relaxes( contracts, relaxes ) and moves down up( down, up ).
The volume in the lungs increases decreases( increases, decreases ) and the air pressure in the lungs decreases increases( decreases, increases ).

When breathing OUT, using a spirometer, the lid goes up down( up, down ). When breathing in, the lid goes down up( down, up ).