Epithelial tissue.

Cuboidal cells lining kidney tubules are specialized for secretion.

Simple columnar cells lining intestines secrete digestive enzymes and absorb nutrients.

Pseudostratified ciliated columnar cells line the respiratory tract (trachea) to move matter out of lungs. Video:

Stratified squamous cells are found on the skin and esophagus, where rapid cell division allows new cells to replace those sloughed off the surface.

Simple squamous cells line the air sacs of lungs; their thin profile allow gases to diffuse across the plasma membrane.