Tight Junctions: The Barrier Against Fluid Leakage

What are the membrane connections that prevent the leaking of fluid between cells?

A. Tight junctions

B. Gap junctions

C. Desmosomes

Answer:

The membrane connections that prevent the leaking of fluid between cells are called tight junctions.

Tight junctions are like the superheroes of cell connections! They form a tight seal between adjacent cells, making sure that nothing unwanted can pass through. These specialized protein structures, made up of claudins and occludins, act as barriers that regulate the selective permeability of the epithelial or endothelial layer.

Imagine them as the gatekeepers of your body, ensuring that only the right stuff gets in and out. By sealing the intercellular gaps, tight junctions prevent the uncontrolled leakage of fluid, ions, and molecules between cells, helping to maintain the internal environment's proper composition and balance, also known as homeostasis.

So, the next time you think about leaky faucets or pipes, remember that our bodies have their own tight junctions working hard to keep everything sealed and secure!