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Each vein is made of three layers of tissues and fibers:
- The tunica adventitia (outer layer) gives structure and shape to your vein.
- The tunica media (middle layer) contains smooth muscle cells that allow your vein to get wider or narrower as blood passes through.
- Thetunica intima (inner layer) has a lining of smooth endothelial cells, allowing blood to move easily through your vein.
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