The largest diameter arteries have thick muscular walls that alternately contract and relax to help propel blood through the cardiovascular system.

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The largest diameter arteries, known as elastic arteries (e.g., the aorta), have thick walls with a high content of elastic fibers, allowing them to stretch in response to each pulse of blood and help maintain blood pressure by recoiling. It is the smaller muscular arteries that have thicker muscular walls for regulating blood flow to different regions by contraction and relaxation.

The Largest Diameter Arteries Have Thick Muscular Walls That Alternately