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Capillaries are the smallest blood vessels.
Blood vessels are elastic so they can withstand changes in blood pressure and maintain a constant flow of blood through the body. The elasticity of blood vessels also allows them to accommodate the varying volume of blood being pumped by the heart during different activities. This elasticity helps protect the vessels from damage and ensures efficient circulation.
larger blood vessels called veins which carry the blood back to the heart
within blood vessels
The 3 main components of the circulatory system are the heart, blood vessels, and blood. The heart pumps blood through the blood vessels, delivering oxygen and nutrients to cells throughout the body and removing waste products.