Final answer:
Gap junctions enable the diffusion of small signaling molecules such as IP3 or Ca2+ between neighboring animal cells, allowing for direct cell-to-cell communication.
Step-by-step explanation:
The diffusion of second messengers like IP3 or Ca2+ between neighboring cells is made possible through gap junctions. Gap junctions are fluid-filled channels that connect the plasma membranes of adjacent cells in animals, allowing the passage of small signaling molecules or ions. These junctions are critical for direct cell-to-cell communication and are important for cells to coordinate their responses effectively.
The diffusion of second messengers such as IP3 or Ca2+ between neighboring cells is made possible by gap junctions. Gap junctions are connections between the plasma membranes of neighboring cells that allow small signaling molecules to diffuse between the two cells. These fluid-filled channels enable small molecules and ions like Ca2+ to move between cells, facilitating communication and coordination between adjacent cells.