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Epithelium is a fundamental tissue that forms coverings for all body surfaces, lines internal cavities and organs, and constitutes glands. Its primary functions include protection, secretion, absorption, and filtration. Epithelial tissues are classified based on two main characteristics: the number of cell layers and the shape of the cells. 1. Number of layers: Simple epithelium* consists of a single layer of cells, ideal for absorption, secretion, and filtration, found in areas like the lining of blood vessels or kidney tubules. Stratified epithelium* has multiple layers of cells, providing robust protection in areas subject to abrasion, such as the skin or the lining of the mouth. 2. Cell shape: Squamous cells* are flat and scale-like. Cuboidal cells* are cube-shaped. Columnar cells* are tall and column-shaped. Combining these, we get various types: Simple squamous epithelium* is thin for rapid diffusion (e.g., lung alveoli). Simple cuboidal epithelium* is involved in secretion and absorption (e.g., glands, kidney tubules). Simple columnar epithelium* is specialized for absorption and secretion, often with microvilli (e.g., digestive tract lining). Stratified squamous epithelium* provides strong protection against abrasion (e.g., epidermis of skin). Pseudostratified columnar epithelium* appears stratified but is actually simple, with all cells touching the basement membrane, often ciliated (e.g., trachea). Transitional epithelium* is a specialized stratified type that can stretch (e.g., urinary bladder). The differences between these types lie in their specific structural adaptations, which directly determine their specialized functions and locations within the body. What's next? 📸