Question

The columnar epithelium is found in

• A. Lining of intestine
• B. Lining of blood vessel
• C. Seminiferous tubule
• D. Uriniferous tubules

Answer 1

Answer: (A)

SIMPLE COLUMNAR EPITHELIUM:
Structure: The cells of the simple columnar epithelium are tall pillar-like and are placed side by side. The free surface of columnar epithelial cells is smooth. The oval nucleus lies close to the base of the cell.
Location: Simple columnar epithelium forms a lining of the stomach, small intestine, colon, gall bladder, gastric glands, intestinal gland, and pancreatic lobules. Since here it performs the secretory functions, it is called the glandular epithelium. Certain cells of the columnar epithelium of stomach and intestine produce mucus which forms a fine mucus coating over epithelium. These mucus-producing cells are called goblet cells. The epithelium having mucus-secreting cells along with underlying connective-tissue is called mucous membrane or mucosa. The other columnar cells lining the intestine are specialized for the absorption of water and digested food. In order to surface area for absorption, they bear microvilli at the free ends. The columnar epithelium of this called brush-bordered columnar epithelium.
Function: Protection, secretion, and absorption.