Which tissue type is a single layer of columnar cells?

Which tissue type is a single layer of columnar cells?

• A. Simple cuboidal epithelium
• B. Transitional epithelium
• C. Simple columnar epithelium
• D. Simple squamous epithelium

Answer: (C)

Epithelial tissues are classified by number of layers and by cell shape. A single layer of tall, column-like cells is called simple columnar epithelium. In this arrangement, the cells are taller than they are wide, with nuclei typically lined up near the base, which supports absorption and secretion. Goblet cells may be present to produce mucus, and microvilli can decorate the apical surface to increase surface area for nutrient absorption. This tissue type lines parts of the digestive tract, such as the stomach and intestines, as well as the gallbladder, where these functions are important. Other tissues differ in either shape or layering. Simple squamous epithelium is a single layer of flat cells suited for diffusion, simple cuboidal epithelium is a single layer of cube-shaped cells good for secretion and absorption, and transitional epithelium is multilayered and stretchy, lining the urinary tract.

Epithelial tissues are classified by number of layers and by cell shape. A single layer of tall, column-like cells is called simple columnar epithelium. In this arrangement, the cells are taller than they are wide, with nuclei typically lined up near the base, which supports absorption and secretion. Goblet cells may be present to produce mucus, and microvilli can decorate the apical surface to increase surface area for nutrient absorption. This tissue type lines parts of the digestive tract, such as the stomach and intestines, as well as the gallbladder, where these functions are important.

Other tissues differ in either shape or layering. Simple squamous epithelium is a single layer of flat cells suited for diffusion, simple cuboidal epithelium is a single layer of cube-shaped cells good for secretion and absorption, and transitional epithelium is multilayered and stretchy, lining the urinary tract.