In the image to the right, what feature is the yellow arrow pointing to?

• A. Basement membrane.
• B. Cilia.
• C. Microvilli.
• D. Apical surface.

Answer: (A)

Verified step by step guidance

1. Examine the image closely to identify the structure the yellow arrow is pointing to. Notice the location and characteristics of the structure in relation to the surrounding cells.
2. Understand the options provided: Basement membrane, Cilia, Microvilli, and Apical surface. Each of these structures has distinct features and locations in epithelial tissue.
3. The basement membrane is a thin, fibrous, extracellular matrix that separates the epithelium from underlying connective tissue. It is typically located at the base of epithelial cells.
4. Cilia are hair-like projections on the apical surface of some epithelial cells, involved in movement of substances across the cell surface.
5. Microvilli are small, finger-like projections on the apical surface of epithelial cells, increasing surface area for absorption. The apical surface is the free surface of epithelial cells facing the lumen or external environment.