What are arteries veins and capillaries made of

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  • Blood vessels consist of arteries, arterioles, capillaries, venules, and veins. Vessel networks deliver blood to all tissues in a directed and regulated manner.
  • Arteries and veins are composed of three tissue layers.
  • The thick outermost layer of a vessel (tunica adventitia or tunica externa ) is made of connective tissue.
  • The middle layer ( tunica media ) is thicker and contains more contractile tissue in arteries than in veins. It consists of circularly arranged elastic fibers, connective tissue, and smooth muscle cells.
  • The inner layer ( tunica intima ) is the thinnest layer, comprised of a single layer of endothelium supported by a subendothelial layer.
  • Capillaries consist of a single layer of endothelium and associated connective tissue.

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