The blood vessels comprise part of the cardiovascular system, a system which is responsible for providing muscles with oxygenated blood and removing deoxygenated blood. Therefore a footballer requires an effective and efficient cardiovascular system to be able to perform at their optimum level, otherwise their muscles will not be able to complete the tasks being asked of them.

There is approximately 5-6 litres of body within the body of an adult and it accounts for 7-8% of the total body weight. The composition of blood is:

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