Which of the Following Statements Concerning Gap Junctions Is NOT

Which of the following statements concerning gap junctions is NOT correct?

A) Gap junctions are communicating junctions.
B) At a gap junction, filaments of unknown composition extend between the plasma membranes of two closely adjacent but not touching cells, acting as "spot rivets" to anchor the cells together.
C) Gap junctions are formed by small connecting tunnels that link two adjacent cells and permit exchange of small water-soluble particles between the cells.
D) Gap junctions play an important role in transmission of electrical activity throughout an entire muscle mass.

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