Discussion
Gap junctions differ from tight junctions in that gap junctions
Answer: A
Correct answer: let small molecules pass between adjacent cells
A gap junction is a channel joining two cytoplasms, so ions and molecules up to about a kilodalton pass directly from one cell to the next - which is how cardiac and smooth muscle are electrically coupled. A tight junction does the opposite: it seals the space *between* cells so that nothing leaks past them, which is what makes an epithelium a barrier.
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