Tunica interna (intima) Inner layer of arteries and veins Endothelium made of simple squamous epithelial cells.

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Presentation transcript:

Tunica interna (intima) Inner layer of arteries and veins Endothelium made of simple squamous epithelial cells

Tunica media Consists of smooth muscle

Tunica externa (adventitia) Made of connective tissue

Artery

Arteriole Small blood vessel coming off a larger artery

Capillary Filled with red blood cells Smallest of the body’s blood vessels

Venule Small blood vessel feeding into a larger vein

Arteriole and Venule Compared Arteriole Venule

Vein

One-way valve

Oxygenated blood (red vessels)

Deoxygenated blood (blue vessels)

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