GENNARO & GRILLONE / SCIENCE PHOTO LIBRARY. GENNARO & GRILLONE / SCIENCE PHOTO LIBRARY.
Light micrograph of a transverse section of a small vein (centre). The wall of the vein consists of 2-3 layers of smooth muscle fibres, and is relatively thin, compared to the diameter of the lumen (the inside area). Within the lumen, red blood cells (erythrocytes) are evident. Mag.
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