gap junction
This term is a technical biological descriptor used primarily in histology, physiology, and cell biology. It describes a physical channel that bridges the cytoplasm of two cells, facilitating rapid chemical and electrical communication. In a clinical or academic register, it is used to explain how tissues like the heart or smooth muscle act as a single functional unit (a syncytium).
Because it refers to a specific anatomical structure, it is used almost exclusively in scientific contexts. It should not be confused with general "gaps" or "junctions" in engineering or linguistics, as it specifically denotes a protein-lined pore (connexon) that allows selective permeability between cells.
Meanings
A specialized intercellular connection in animal tissues that allows the direct passage of ions and small molecules between adjacent cells.
The heart's electrical impulses are coordinated through gap junctions between cardiac muscle cells.