Question

a type of intercellular junction that stops materials from crossing an epithelium between cells is called a
tight junction.
gap junction.
zonula adherens.
desmosome.
hemidesmosome.

Explanation:

To solve this, we analyze each option:

• Tight junctions (also called occluding junctions) form a seal between adjacent epithelial cells, preventing the passage of materials between cells.
• Gap junctions allow for communication and passage of small molecules between cells, not blocking material movement.
• Zonula adherens (adherens junctions) help in cell - cell adhesion and maintaining tissue integrity, not blocking material passage.
• Desmosomes are for strong cell - cell adhesion, especially in tissues under mechanical stress, and do not block material movement between cells.
• Hemidesmosomes attach epithelial cells to the basement membrane, not related to blocking material between cells.

So the correct option is the one that stops materials from crossing between epithelial cells, which is tight junction.

Answer:

A. tight junction.