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Vein Illustration and Icon
Vein
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Stylized longitudinal section of a blood vessel showing a vein with a blue lumen and bicuspid venous valve leaflets. The structure represents an anatomical vessel within the cardiovascular system (CVS), lined by endothelium (tunica intima) and surrounded by a thin tunica media and thicker tunica externa. In physiology, veins return blood to the heart and the valve prevents retrograde flow, particularly in peripheral circulation. Hierarchically, valve cusps reside within the vein, which is part of the systemic vasculature.
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