Question

Which of the three types of cell junctions permits communication between cells? Explain. (pages \(74-76\) )

Short answer

In conclusion, among the three types of cell junctions (tight junctions, desmosomes, and gap junctions), it is the gap junctions that permit communication between cells. Gap junctions consist of small channels connecting the cytoplasm of adjacent cells, allowing molecules, ions, and electrical signals to pass directly from one cell to another. This direct communication is essential for coordinating various cellular activities and maintaining tissue and organ functions.

Step-by-step solution

Identify the three types of cell junctions

The three types of cell junctions that we need to consider are: 1. Tight junctions 2. Desmosomes 3. Gap junctions

Choose the cell junction type that allows communication between cells

Among the three types of cell junctions, gap junctions are the ones that permit communication between cells.

Explain how gap junctions permit communication between cells

Gap junctions are small channels that connect the cytoplasm of adjacent cells, allowing molecules, ions, and electrical signals to pass directly from one cell to another. This direct communication is essential for coordinating the activities of different cells, such as synchronizing the contraction of muscle cells for proper functioning or sharing metabolic and electrical information between cells to maintain tissue homeostasis. In conclusion, gap junctions are the type of cell junctions that allow communication between cells by providing direct connections for the exchange of molecules, ions and electrical signals. This communication is crucial for coordinating cellular activities and maintaining the overall function of tissues and organs.