Desmosomes primarily function in

• A. Cell adhesion without sealing
• B. Electrical signaling between cells
• C. Sealing of epithelial layers
• D. Rapid ion transport across membranes

Answer: (A)

Desmosomes provide strong mechanical adhesion between neighboring cells. They act like rivets that hold cells together, anchored to intermediate filaments inside the cells, which helps tissues resist stretching and tearing. This makes them ideal for tissues under mechanical stress, such as skin and heart muscle.

Because their job is to stick cells together, desmosomes do not form seals around the spaces between cells (that’s the role of tight junctions). They also don’t create channels for electrical signaling or rapid ion transport between cells (that’s the domain of gap junctions or membrane channels). So their primary function is cell adhesion without sealing.