Which of the following statements concerning gap junctions is incorrect?
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.
E) connexons are an important structural component of gap junctions.

Question

Quizplus · Accepted Answer

Filaments do not extend between the plasma membranes of two closely adjacent but not touching cells at a gap junction. Instead, gap junctions are formed by connexons, which are protein channels that create a direct passage between the cytoplasm of two adjacent cells, allowing communication and exchange of small molecules.

Which of the Following Statements Concerning Gap Junctions Is Incorrect