Question

The presence of _______ means that substances must pass through, rather than between, the epithelial cells that form the lining of the small intestine.

Answer 1

Answer: Tight junctions

Explanation:

The tight junction is the band lies beneath the apical surface. The function of tight junction is to seal the epithelial cells. The tight junctions allows the movement of ions and molecules across the epithelial layer of cells. These forms the lining of the small intestine.

Tight junctions seal adjacent epithelial cells in a narrow band just beneath their apical surface. They consist of a network of claudins and other proteins. Tight junctions restrict, limit, reduce the passage of molecules in between the space between the cell.

Answer 2

Answer: The presence of tight junctions.

Explanation:

Tight junctions are areas between epithelial and endothelial cells and they are connected by trans membrane proteins such as claudins and occludins that join together to form a barrier limiting substances movement in cells. Tight junctions seals adjacent epithelial cells beneath their apical surfaces. Tight junctions limit the passage of molecules and ions through the space between cells. They are found between the body epithelial.