What makes us feel the need to exhale physically?

Question

What makes us feel the need to exhale physically?

In: Biology

Answer 1

It’s a bit the opposite of that:

Breathing involves a large muscle under the lungs called the diaphragm that we squeeze downward to breathe in. This creates a vacuum that causes air to come into your lungs.

Then there is the relaxation phase, essentially passive, your diaphragm relaxes and that pushes air back out of your lungs, letting them deflate.