When exercising the circulatory system adapts, this is because the need for more oxygen entering the muscles is important. The majority of blood during exercise flows mainly to the heart, the brain and the working muscles. The vital organs have minimal blood flow.
Arteries and Veins can either constrict or dilate during exercise as this is the most efficient way of redistributing blood. In the working muscles the arteries dilate so the increase of blood can flow through the capilleries more effectively. This means that there is an increase of Oxygen supplied and a decrease of carbon dioxide in the muscles.
The nervous system also adapts as it secretes hormones which signals the body when exercise begins. The hormones signal the the blood vessells to dilate in the heart and the working muscles.
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