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[Free Registration/Login may be required to access all resource tools.] The blood vessels are an important part of the cardiovascular system. They connect the heart to every cell in the body. Arteries carry blood away from the heart, while veins return blood to the heart. Learn more about blood vessels in this learning module produced by CK-12.
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- Knovation Readability Score: 3 (1 low difficulty, 5 high difficulty)