The main function of compound epithelium is

Cuboidal Epithelium - Types and Functions What are Epithelial Cells? Epithelium or epithelial cells are specialised cells that perform specific functions. It is typically a continuous and thin layer of compactly packed cells with a very little intercellular matrix. The epithelial cells can be secretory (glandular epithelia) or lining epithelia. It is more of a discretional functional grouping as there are lining epithelia that also have secretory cells (e.g., the lining of the stomach). Also, there are glandular cells that are dispersed among the lining cells (e.g., mucous cells in the trachea and Types of Epithelial Cells Based on the total cell layers, epithelia can be classified into – • Simple epithelium– comprise a single cell layer • Stratified epithelium– comprises two or more cell layers Based on the cell shape, the simple and stratified can be further divided into – • Squamous– cells are flat and thin • Cuboidal– cells with roughly similar thickness and width • Columnar – cells are taller than wide Explore: Cuboidal Epithelium Cuboidal epithelial cells are short cells with roughly similar thickness and width. They usually appear hexagonal in a cross-section. The simple cuboidal epithelia are more common than the stratified cuboidal epithelia. A few cuboidal epithelial cells located in different parts are discussed here – • The intercalated ducts (a portion of the exocrine gland) has the thinnest epithelium that is typically distinguished as “low” simple cuboid...

Learning Objectives Describe the structural characteristics of the various epithelial tissues and how these characteristics enable their functions. By the end of this section, you will be able to: • Explain the general structure and function of epithelial tissue • Distinguish between tight junctions, anchoring junctions, and gap junctions • Distinguish between simple epithelia and stratified epithelia, as well as between squamous, cuboidal, and columnar epithelia • Describe the structure and function of endocrine and exocrine glands Epithelial tissue primarily appears as large sheets of cells covering all surfaces of the body exposed to the external environment and lining internal body cavities. In addition, epithelial tissue is responsible for forming a majority of glandular tissue found in the human body. Epithelial tissue is derived from all three major embryonic layers. The epithelial tissue composing cutaneous membranes develops from the ectoderm. Epithelial tissue composing a majority of the mucous membranes originate in the endoderm. Epithelial tissue that lines vessels and open spaces within the body are derived from mesoderm. Of particular note, epithelial tissue that lines vessels in the lymphatic and cardiovascular systems is called endothelium whereas epithelial tissue that forms the serous membranes lining the true cavities is called mesothelium. Regardless of its location and function, all epithelial tissue shares important structural features. First, epithel...

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An extremely important feature of the intestinal epithelium is its function as a physical barrier between the environment and our bodies’ internal milieu. At the same time it has to allow for uptake of important nutrients. At least four different transport mechanisms exist that allow selective uptake and transport of macromolecules across the epithelial cell layer, i.e. paracellular transport, passive diffusion of molecules from the apical to the basolateral side, vesicle-mediated transcytosis and carrier-mediated uptake and diffusion through the epithelial cell layer. Each of these transport mechanisms depends on the physicochemical properties of the compound, its ability to interact with the plasma membrane, its molecular weight and size, stability and charge distribution. In vivo, parameters not directly associated with the molecule in question will influence uptake and transepithelial transport. Intestinal motility, interactions with other molecules from the diet and the digestive process like bile salts and enzymes, and solubility in the mucus layer will affect the absorption process. Thus, in vitro models for studying absorption through the intestinal epithelium have several limitations. Still, they are considered useful model systems for such purposes. Similarly, effects of bioactive molecules on the epithelium can be studied by measuring barrier function and effects on transport processes. Keywords • Polarized epithelium • barrier function • tight junctions • trans...

• The compound epithelium is made of more than one layer of cells and thus has a limited role in secretion and absorption. Their main function is to provide protection against chemical and mechanical stresses. • They cover the dry surface of the skin, the moist surface of the buccal cavity, pharynx, inner lining of ducts of salivary glands and of pancreatic ducts. So, the correct option is 'All of the above'.