Cross section of vein. Blood vessel anatomy.

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Photo credit: © Tetiana Zhabska / Alamy / Afripics
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Keywords: anatomy, artery, bio, biology, blood, capillary, cardiovascular, cava, cell, circulatory, coronary, cross, diagram, disease, flow, health, human, illustration, intima, learn, learning, media, medical, medicine, organ, part, physiology, science, section, structure, system, thrombosis, valve, vascular, vector, vectors, vein, vena, vessel