During normal breathing at rest, inspiration is an active process while expiration is passive. So under normal conditions, you put more energy into inspiration than expiration.
it is an example of a hinge joint.
Actin Changes Shape
Apex
Myosin binds to Actin
APEX
Muscles that bend a joint are flexors; musces that straighten a joint are extensors.
They get rid of carbon dioxide and create oxygen. (they clean the air)