During inhalation, the diaphragm moves downward to increase space in the chest cavity, allowing full expansion of the lungs. During exhalation, the diaphragm moves towards the chest cavity to ...

The diaphragm is really dome-shaped and flattens during inhalation, while in the model, a flat rubber sheet is pulled down The space between the lungs and wall of the thorax is very small but the ...

During inhalation, the diaphragm contracts and pulls downward, and the ribs elevate. These actions increase the volume of the chest cavity, decreasing the pressure inside it.