What happens to your diaphragm when you inhale?

When you inhale or breathe in, your diaphragm tightens and moves downward. This is to increase the space in your chest cavity to make the lungs expand. 

Aside from the diaphragm helping to expand the chest cavity, the intercostal muscles found between your ribs also help enlarge the chest cavity.

The only number less than 8 that can equal 12 would be 6, 36 is the dividend