Structure , location and function of columnar epithelium
Answers
Answer:
Columnar epithelium forms the lining of the stomach and intestines. The cells here may possess microvilli for maximizing the surface area for absorption, and these microvilli may form a brush border. Other cells may be ciliated to move mucus in the function of mucociliary clearance.
Explanation:
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Answer:
STRUCTURE:
The cells of this epithelium are arranged in a neat row with the nuclei at the same level, near the basal end. In a cross-section of the organ, these cells appear like thin columns, differentiating them from flattened squamous cells and square-shaped cuboidal cells. Among simple epithelia, this sub-type can withstand some degree of wear and tear.
LOCATION
Epithelial tissues line the outer surfaces of organs and blood vessels throughout the body, as well as the inner surfaces of cavities in many internal organs. An example is the epidermis, the outermost layer of the skin.
FUNCTION
These long cells are specially adapted for secretion and absorption. The presence of microvilli on the apical surface of this epithelium increases surface area. In the small intestine, these cytoplasmic projections contain membrane-bound enzymes that complete the final stages of digestion. Their location on the membrane, close to transmembrane transport proteins allows the end products of digestion to be quickly and immediately absorbed into the body.
This epithelium is also structured to provide a barrier against non-specific movement of lumenal substances. Junctional complexes that limit the passage of molecules and ions through intercellular spaces hold the cells of this epithelium together. This is particularly important in the digestive system, which has a large surface area interacting with the external environment.
Ciliated cells of this epithelium are designed to transport particles in a specific direction through wave-like movements.
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