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Epithelial cell

Column-shaped cells bound to one another to form a continuous covering sheet that is protective in function. They contain small finger-like projections (microvilli) to increase the surface area where they are located.

Mucous producing cell

A goblet cell continually secretes mucous as a mechanical barrier, antimicrobial shield, and food lubrication.

Arteriole

Short narrow muscular blood vessels branch into capillaries that carry blood to endothelial cells.

__Venule __

A small blood vessel that allows the capillaries to drain blood in the larger veins.

Lymph vessel

A thin tube that carries lymph (lymphatic fluid) and white blood cells through the lymphatic system.