Blood capillary — Free Physiology Illustration

Physiology

Blood capillary

Microscopic blood capillary depicted as a very thin, delicate pale pink to reddish-pink tubular microvessel with a tiny narrow central lumen just wide enough for red blood cells to pass single file. The wall is extremely thin and minimal, formed by a single layer of flattened endothelial cells, appearing smooth, fragile, and slightly semitransparent. It may be shown as a short uniform or slightly curved segment, a small branching microvessel, or in cross-section as a tiny circular to slightly elongated lumen surrounded by a delicate endothelial wall. In some views, tiny red blood cells may be visible within the lumen to emphasize the minute diameter and microcirculatory role.

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