When you exercise, your muscles need more energy so they can contract.
You need to increase the rate at which oxygen and glucose reach the muscle cells for aerobic respiration.
You also need to remove the extra waste carbon dioxide produced more quickly.
The heart rate increases and the blood vessels supplying the muscles dilate. This allows more blood containing oxygen and glucose to reach the muscles.
Your breathing rate and depth of each breath also increase. This allows a greater uptake of oxygen and release of carbon dioxide at the lungs.
Muscles store glucose as glycogen. The glycogen can be converted back to glucose for use during exercise.
ANAEROBIC RESPIRATION: glucose --> lactic acid
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