... Language 2000) Like other muscles, the heart needs more oxygen when it exercises/contracts. As the heart is constantly contracting it requires a constant and large supply of oxygen. Coronary arteries are blood vessels that supply oxygen and vital nutrients to the heart, and ensure that the heart has a sufficient supply of oxygen to meet the demands placed upon it. ... to suffer from angina, the best thing that can be prescribed is exercise. It has been suggested that exercise sufferers can counteract the genetic risk of stiff arteries or hardening of the arteries, which can have an eff...

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• Grade Level: High School