Which tissue type forms the lining of organs and covers body surfaces?

Which tissue type forms the lining of organs and covers body surfaces?

• A. Nervous tissue
• B. Connective tissue
• C. Muscle tissue
• D. Epithelial tissue

Answer: (D)

Epithelial tissue forms the lining of organs and covers body surfaces. These tightly packed cells create continuous sheets that line the interior of cavities and tubes, such as the digestive tract, airways, and blood vessels, as well as the outer skin. They sit on a basement membrane to stay anchored and can be arranged as a single layer for absorption and exchange or in multiple layers for protection. Epithelial tissue also often specializes in secretion or absorption, as seen in glands or intestinal lining, and it acts as a barrier controlling what passes in and out. In contrast, nervous tissue transmits signals, muscle tissue contracts, and connective tissue supports and binds structures, so they are not primarily responsible for lining and covering surfaces.

Epithelial tissue forms the lining of organs and covers body surfaces. These tightly packed cells create continuous sheets that line the interior of cavities and tubes, such as the digestive tract, airways, and blood vessels, as well as the outer skin. They sit on a basement membrane to stay anchored and can be arranged as a single layer for absorption and exchange or in multiple layers for protection. Epithelial tissue also often specializes in secretion or absorption, as seen in glands or intestinal lining, and it acts as a barrier controlling what passes in and out. In contrast, nervous tissue transmits signals, muscle tissue contracts, and connective tissue supports and binds structures, so they are not primarily responsible for lining and covering surfaces.