Columnar epithelial cell

Columnar epithelial cells are a type of epithelial cell that have a column-like shape. They are found in various locations throughout the body, including the digestive tract, the respiratory tract, and the reproductive system.

Structure

Columnar epithelial cells are taller than they are wide, giving them a column-like appearance. The nucleus is usually located near the base of the cell. These cells may be simple, consisting of a single layer of cells, or stratified, consisting of multiple layers.

Function

The primary function of columnar epithelial cells is to provide protection. In the digestive tract, they also play a role in absorption and secretion. In the respiratory tract, they help to move mucus and other substances via the action of cilia. In the reproductive system, they assist in the movement of eggs and sperm.

Types

There are several types of columnar epithelial cells, including:

• Simple columnar epithelial cells: These are a single layer of tall, closely packed cells. They are found in areas of the body where absorption and secretion are primary functions, such as the small intestine.

• Stratified columnar epithelial cells: These are multiple layers of cells, with the columnar cells only in the upper layer. They are found in areas of the body that require protection, such as the pharynx, the male urethra, and some glandular ducts.

• Ciliated columnar epithelial cells: These cells have cilia on their surface, which help to move substances along. They are found in the respiratory tract and the female reproductive tract.

• Goblet cells: These are a type of columnar cell that secrete mucus. They are found in the respiratory tract and the digestive tract.

See also

• Epithelial cell
• Simple epithelium
• Stratified epithelium
• Ciliated epithelium
• Goblet cell