Response to increased need for oxygen? You need more oxygen when exercising so you breath faster/deeper. Having a bigger mouth doesn't mean your lungs can use all that you breathe in, nor does it mean your blood can carry more oxygen from your lungs to your muscles.
Response to increased need for oxygen? You need more oxygen when exercising so you breath faster/deeper. Having a bigger mouth doesn't mean your lungs can use all that you breathe in, nor does it mean your blood can carry more oxygen from your lungs to your muscles.