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## Types and Categories of Epithelium - **Regenerative**: All types of epithelium shed cells from their surfaces continuously. ### **Types** - **Simple**: One layer (blood vessels, body cavities) regulates passage - **Stratified**: More than one layer - **Transitional**: Lines bladder, ureters....

## Types and Categories of Epithelium - **Regenerative**: All types of epithelium shed cells from their surfaces continuously. ### **Types** - **Simple**: One layer (blood vessels, body cavities) regulates passage - **Stratified**: More than one layer - **Transitional**: Lines bladder, ureters. Allows urinary organs to expand and stretch. - **Pseudostratified**: Closely packed cells of different sizes. - **Squamous**: Flat and thin - **Cuboidal**: Cubed shaped. - **Columnar**: Rectangular, tall ### **Simple Epithelium** - **Simple Squamous Epithelium**: Forms thin barriers (kidneys) Bowmans Capsule. - **Simple Cuboidal Epithelium**: Typically found in glandular (secreting) tissues and kidneys. - **Simple Columnar Epithelium**: Absorption. Usually has cilia and microvilli. Line stomach and intestines. Secretion - most prolific. ### **Stratified Epithelium** - **Stratified Squamous Epithelium**: Epidermis (skin). Protective functions. - **Stratified Cuboidal Epithelium**: Uncommon. Sweat glands + salivary. - **Stratified Columnar Epithelium**: Protective + mucus secreting. Found in mucous membrane (conjunctiva) lining your eyelids. Pharynx, Anus.