Final answer:
The diaphragm moves downward during inspiration, allowing us to breathe by lowering the air pressure inside the lungs.
Step-by-step explanation:
The diaphragm moves downward during inspiration, allowing us to breathe.
When we inhale, the diaphragm contracts and moves downward, while the rib muscles contract and cause the ribs to move outward. This increases the volume of the chest, lowering the air pressure inside the lungs and creating a partial vacuum. As a result, outside air flows into the lungs.
The movement of the diaphragm is crucial for breathing and plays a key role in the mechanics of inhalation.