The epithelial tissue that is present in the interior of the body is called endothelium. One side of the epithelial cell is oriented towards the surface of the tissue, body cavity, or external environment and the other surface is joined to a basement membrane. Simple epithelia are made of a single layer of cells that are in direct contact with the basement membrane with a common apical surface. The stratified squamous epithelium has two or more layers of cells. This forms a protective barrier. Thank you very much. It is also found in air sacs of lungs, glomerular (Bowman’s) capsule of kidneys, and the inner surface of the tympanic membrane (eardrum). C. There are multiple cell layers in pseudostratified epithelia. Simple cuboidal epithelium, located in the ducts and secretory portions of small glands and in kidney tubules, secrete and absorb substances. Home » Biology » Epithelial Tissue – Definition, types, functions, examples, Last Updated on May 31, 2020 by Sagar Aryal. 5 Characteristics of epithelium source link Epithelial tissues have five main characteristics. Epithelial cells display attachment which means that the basal surface of the cells are attached to a special layer called the basal lamina or basement membrane. The effects of exocrine gland secretions are limited, and some of them would be harmful if they entered the bloodstream. Arrows point to the released substances. This epithelium develops a tough layer of keratin in the apical segment of cells and several layers deep to it. This is achieved by the presence of tight junctions between two epithelial cells. Similarly, the esophagus is also exposed to a wide range of different textures, pH levels and chemical compositions from food and drink. Epithelial layers are avascular, but innervated. Epithelial tissues play the role of separating two structures from each other. Structural Characteristics: Epithelial tissue covers the external of the body and lines organs, vessels (blood and lymph), and cavities. i. Keratinized stratified squamous epithelium, ii. Epithelium also serves as glandular epithelium. The basal lamina is secreted by the cells of the epithelial tissue itself and contains proteins, glycoproteins, and collagen IV, a type of structural protein that forms sheets. The columnar epithelium is made by a single layer of cells, rectangular in shape, on a basement membrane. The secretions of endocrine glands, called hormones, enter the interstitial fluid and then diffuse into the bloodstream without flowing through a duct. A. Ciliated tissue lines the trachea and much of the upper respiratory tract, Secrete mucous; ciliated tissue moves mucous, Sweat glands, salivary glands, and mammary glands. Epithelial tissue covers the body, lines all … Unless otherwise noted, LibreTexts content is licensed by CC BY-NC-SA 3.0.

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