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| Epithelial Cell Shape | Tissue Components | Location | Function | |-----------------------|------------------|-------------------------|--------------------------------------------------| | Squamous | Single layer | Lining of blood vessels, heart, alveoli | Diffusion, secretion, filtration | | | Multiple layers | Skin (epidermis) | Protection, permeability | | Cuboidal | Single layer | Kidney tubules, glands | Secretion, absorption, limited protection | | | Multiple layers | Ducts of glands | Secretion, absorption | | Columnar | Single layer | Intestines, stomach | Absorption, secretion | | | Multiple layers | Respiratory tract, | Protection, secretion | | | | female reproductive | | | | | tract, glands | | | Transitional | Stratified | Urinary bladder, | Stretchability, allowing organ expansion | | | | ureters | and contraction |