artery (thick muscular walls), vein (contains valves to prevent the back flow of blood, capillary (tiny microscopic vessels), A. tunica interna of artery, B. tunica media of artery, C. tunica externa of artery, valve , A. tunica interna of vein, B. tunica media of vein, C. tunica externa of vein, A. tunica interna of capillary.

Labeling Blood Vessel Tunics (#6 on Wksht)

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