An epithelium with one layer of tall slender cells is called
A simple squamous
B stratified columnar
D simple columnar
D simple cuboidal
The correct answer and explanation is:
The correct answer is D) simple columnar.
Explanation:
The term “simple” refers to a single layer of cells, while the term “columnar” describes the shape of the cells. Simple columnar epithelium consists of a single layer of tall, slender (or rectangular) cells. These cells are taller than they are wide, and they often have an elongated nucleus located near the base of the cell. This type of epithelium is specialized for absorption, secretion, and protection.
Simple columnar epithelium can be found in areas where absorption and secretion are important. One of the most common locations is in the digestive tract, particularly the lining of the stomach and intestines. The tall cells of simple columnar epithelium allow for a larger surface area, which is crucial for nutrient absorption. Additionally, some simple columnar epithelium cells have microvilli on their apical surface, further increasing the surface area for absorption.
It is important to distinguish this epithelium from other types, such as:
- Simple squamous epithelium (Option A): This consists of a single layer of flat cells, not tall and slender, and is commonly found in areas where diffusion or filtration occurs, like the alveoli of the lungs or the lining of blood vessels.
- Stratified columnar epithelium (Option B): This type consists of multiple layers of columnar cells, providing a protective function, typically found in areas like the male urethra and parts of the pharynx.
- Simple cuboidal epithelium (Option D): This consists of a single layer of cube-shaped cells, often found in glands, ducts, and kidney tubules.
In summary, simple columnar epithelium is a single layer of tall, slender cells, specialized for absorption and secretion.