Which location is typical for simple cuboidal epithelium?

Which location is typical for simple cuboidal epithelium?

• A. Lining of airways
• B. Digestive tract
• C. Lining ducts and kidney tubules
• D. Skin surface

Answer: (C)

The main idea here is where simple cuboidal epithelium is typically found. This tissue is a single layer of cube-shaped cells, each with a relatively large, central nucleus, and it’s specialized for secretion and absorption. Because of its thin, uniform layer, it lines areas where passage of substances between compartments occurs, such as ducts and kidney tubules. Lining ducts and kidney tubules is the classic example. In the kidneys, the tubules are lined by simple cuboidal cells that reabsorb water and nutrients and secrete substances into the filtrate. In many glands, the small ducts are also lined by simple cuboidal epithelium, supporting secretion and transport of fluids. The other options reflect different epithelia: the lining of airways is typically a pseudostratified ciliated columnar epithelium, not a single-layer cuboidal; the digestive tract is lined by simple columnar epithelium specialized for absorption with microvilli; and the skin surface is protected by stratified squamous epithelium, not a single cell layer. So, lining ducts and kidney tubules is the location that matches simple cuboidal epithelium.

The main idea here is where simple cuboidal epithelium is typically found. This tissue is a single layer of cube-shaped cells, each with a relatively large, central nucleus, and it’s specialized for secretion and absorption. Because of its thin, uniform layer, it lines areas where passage of substances between compartments occurs, such as ducts and kidney tubules.

Lining ducts and kidney tubules is the classic example. In the kidneys, the tubules are lined by simple cuboidal cells that reabsorb water and nutrients and secrete substances into the filtrate. In many glands, the small ducts are also lined by simple cuboidal epithelium, supporting secretion and transport of fluids.

The other options reflect different epithelia: the lining of airways is typically a pseudostratified ciliated columnar epithelium, not a single-layer cuboidal; the digestive tract is lined by simple columnar epithelium specialized for absorption with microvilli; and the skin surface is protected by stratified squamous epithelium, not a single cell layer.

So, lining ducts and kidney tubules is the location that matches simple cuboidal epithelium.