Describe how the Diaphragm affects Breathing in and Out.

A large dome-shaped muscle under the lungs called the diaphragm squeezes downward when you breathe in, making a vacuum that causes a rush of fresh air into your lungs. The opposite happens when you breathe out -- your diaphragm relaxes upward, pushing on your lungs, letting them deflate. (A whole explanation from my science book. Hope this helps!)

relationship between pressure and air volume and led to the understanding of how respiration works; i believe this is the correct answer ; /// good luck