Question

which type of cell junction facilitates communication between the cardiac muscle cells of the heart by allowing ions to flow through the cells cytoplasm via hollow cylinders (connexons)?

Explanation:

To determine the correct cell junction, we analyze each option:

• Tight junctions: Form a barrier to prevent leakage between cells, not for communication via ions.
• Anchoring junctions (including desmosomes): Provide mechanical strength and attachment between cells, not for ion flow communication.
• Gap junctions: Consist of connexons (hollow cylinders) that allow ions and small molecules to pass between cells, facilitating communication (e.g., in cardiac muscle for synchronized contraction).

Answer:

B. Gap junctions