Gland cells arise from epithelial tissue when a portion of the epithelium folds inward, forming a multicellular gland.
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Cuboidal epithelium lines the kidney tubules and ducts of salivary glands, providing mechanical support.
In the respiratory tract, columnar epithelium has cilia, which move to push mucus forward and help clear it from the airways.
Columnar epithelium is found in the inner lining of the intestine, where it facilitates absorption and secretion across the epithelial barrier.
It is referred to as stratified squamous epithelium because the cells are arranged in multiple layers, providing protection against wear and tear.