When you ____, your ____ need more ____ and glucose so they can ____ and release ____ to keep you going. During exercise, your ____ rate and depth of breathing ____ so you can get more oxygen into your blood. If you exercise regularly, the muscles that you use to ____ (the ____ and intercostal muscles) will get ____. This means that your ____ cavity can open up more when you breathe in, so you can get more ____ into your lungs. Over time, regular exercise can also cause an increase in the ____ and size of the small ____ vessels in your lungs and in the number of alveoli. This makes gas exchange more ____.

Exercise

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