Arteries vs. Veins: Key Similarities and Differences

Similarities Between Arteries and Veins

• Both are blood vessels carrying blood throughout the body. Arteries carry oxygenated blood away from the heart; veins return deoxygenated blood.
• Both have three tissue layers: tunica intima (endothelium), tunica media (smooth muscle), tunica adventitia (connective tissue).
• Both contain valves ensuring one-way flow. Arteries have aortic/pulmonary valves; veins have venous valves.
• Both are regulated by the nervous system, which can constrict or dilate vessels to alter blood flow.