Your lung is totally elastic organ. If air enters the pleura, lung will contract. It will be useless for respiration in such case. You have to put under water seal to take out the air from the pleura. If air happens to enter in both of the pleura, you will die in 5 minutes.
This disease is called emphysema. This happens when you breath out and your lungs don't contract like they normally do.
The pressure under water is stronger than the pressure in air so the paumotan diver's lungs contract when they dive.
Contract with America happened in 1994.
Contract J.A.C.K. happened in 2003.
Knights Contract happened in 2011.
Your lungs are placed in the thorax. Your thorax or chest expand and contract. So that your lungs get and gives air. This happens simultaneously. So the lungs work together.
The lungs can expand and contract due to the presence of specialized muscles called the diaphragm and intercostal muscles that help regulate the volume of the thoracic cavity. When these muscles contract, the volume of the chest cavity increases, causing air to flow into the lungs (inhalation). When these muscles relax, the volume decreases, causing air to flow out of the lungs (exhalation).
The muscles in your diaphragm contract to push the air out of your lungs.
Inspiration - the process of breathing in. The lungs expand and take in air.
note when we yarn our lungs contract this is proven because our chest move inward as air is release.
Lungs are passive players in pulmonary ventilation. The diaphragm and intercostal muscles contract to create a pressure gradient that allows air to move in and out of the lungs. The lungs simply expand and contract in response to these pressure changes.
I believe that answer is the diaphragm. As the diaphragm moves up and down, it expands the lungs, and when the diaphragm goes up, the lungs release the air out again.