The type of cell junction that closes off the space between epithelial cells, thereby limiting the passage of small molecules, is the
A) tight junction.
B) adherens junction.
C) desmosome.
D) gap junction.

Question

Quizplus · Accepted Answer

Tight junctions form a continuous barrier between cells, preventing the movement of molecules between them. This is important in epithelial tissues that line organs and glands, where it helps maintain the separation between the inside and outside of the body. Adherens junctions help cells stick together and are found in many tissues, but do not form a tight barrier. Desmosomes provide strong mechanical connections between cells, but do not limit the diffusion of molecules. Gap junctions allow for small molecules and ions to pass between cells, which is not what is being asked for in this question.

The Type of Cell Junction That Closes Off the Space