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A cutaway capillary cross section opens to reveal a single red blood cell curled inside its narrow channel. The thin endothelial wall rings the opening, edged with fine bumps and a layered basement membrane, while flattened cells with oval nuclei are sculpted into the surrounding tissue. The rough, organic texture contrasts with the smooth, curved blood cell at the center. It makes a memorable model for an anatomy classroom, a physiology lesson on gas exchange or a science display shelf beside other tissue sections.

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