Arteriole and red blood cells, SEM

Arteriole and red blood cells, SEM


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Arteriole. Coloured scanning electron micrograph (SEM) of a cross-section through a small, thin- walled artery known as an arteriole. Red blood cells are seen in the central space (lumen) and connective tissue surrounds the arteriole. The inner wall (tunica intima) of the lumen is composed of an endothelial lining and a thin elastic layer that stretches. These layers enable the arteriole to expand and contract, regulating arterial blood pressure. Magnification: x 4000.`.

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