Cardiovascular System

Blood Vessels

What are the differences between arteries and veins?

Both arteries and veins have three tissue layers: the inner lining (endothelium), the middle layer (smooth muscle), and the outer layer (connective tissue). However, the walls of the arteries are much stronger and thicker to accommodate the blood under high pressure as it exits the heart. Many veins have valves to help return the blood to the heart.


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