MICROANATOMY

Detailed explanation-1: -The simple columnar epithelium of the digestive tract is non-ciliated and contains dense microvilli. Microvilli help in digestion by secreting digestive enzymes and by absorbing digested food particles.

Detailed explanation-2: -A simple columnar epithelium is a simple epithelium made up of columnar epithelial cells. The columnar epithelial cells are characterized by being taller than wide, i.e. the height is about four times the width. The nucleus is elongated and near the base of the cell.

Detailed explanation-3: -structure and function. …the cell membrane to form microvilli, stable protrusions that resemble tiny bristles. Microvilli on the surface of epithelial cells such as those lining the intestine increase the cell’s surface area and thus facilitate the absorption of ingested food and water molecules.

Detailed explanation-4: -Microvilli serve to increase the surface area of the epithelium for secretion of mucin and enzymes and absorption of nutrients. They often appear all together on light microscopy as a dark fuzzy structure rather than distinct individual structures and are therefore collectively called a brush border.