Transverse section through a small artery and vein. Labels: A, artery; V, vein; e, epithelial lining; m, middle muscular and elastic coat, thick in the artery, much thinner in the vein; a, outer coat of areolar tissue, magnified 350 diameters.

Diagram of an Artery and a Vein

Transverse section through a small artery and vein. Labels: A, artery; V, vein; e, epithelial lining;…