ELi5 – Do puffed out cheeks when holding breath actually get used?

Question

In other words, if I jump in a pool and fill up my lungs and mouth with the stereotypical chipmunk cheeks full of air, do my lungs use any of that air in my cheeks as like a “reserve”? Or is it only the air that made it into the lungs that gets used?

In: 12

Answer 1

You can move the tidal volume of your lungs to mix the deoxygenated air at the end of the airway with fresher air closer to your mouth. It won’t add much though.

Answer 2

You can move the tidal volume of your lungs to mix the deoxygenated air at the end of the airway with fresher air closer to your mouth. It won’t add much though.