Question

Describe the function of the Zonula Occludens (Tight Junctions).

A) Facilitate communication and exchange of molecules between adjacent cells.
B) Provide mechanical support and structural integrity to tissues.
C) Act as channels for the passage of ions and small molecules.
D) Seal the intercellular space, preventing the passage of molecules between adjacent cells.

Answer 1

Option D). Tight junctions, or zonula occludens, seal the intercellular space, preventing the passage of molecules between adjacent animal cells. They are important in maintaining the integrity of epithelial tissues and organs.

Step-by-step explanation:

Animal cells that are adjacent to one another form a watertight seal known as tight junctions, or zonula occludens. They work to stop molecules from moving between cells by sealing the intercellular gap. Tight junctions are frequently observed in the epithelial tissues lining the organ lumens, including the lungs and intestines. Tight junctions establish a strong cellular adhesion that preserves tissue integrity and stops extracellular fluid leakage.