THE LUNGS 1 - the rib cage
protect the lungs and heart
anchor the intercostal muscles
The intercostal muscles
Contract during inhalation
causing the rib cage to expand ,drawing air into the lungs.
Relax during expiration
causing the ribcage to contract, pushing air out of the lungs
Is lowered during inspiration and raised during expiration.
Separates the chest area (the thorax) from the lower part of the
body (the abdomen).