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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                                  |