Final answer:
In class, we discussed three main types of cell-to-cell junctions: tight junctions, which act as selective barriers; anchoring junctions, which provide tissue stability; and gap junctions, which allow intercellular communication. Each type of junction has a unique role in maintaining the integrity and function of epithelial tissues.
Step-by-step explanation:
The types of cell-to-cell junctions we discussed in class were tight junctions, anchoring junctions, and gap junctions. They all contribute to the function and integrity of epithelia in different ways. Tight junctions seal adjacent epithelial cells in a narrow band just beneath their apical surface. They prevent the movement of substances through the extracellular space, creating selective barriers.
Anchoring junctions, including desmosomes, hemidesmosomes, and adherens, provide strong and flexible connections either between the epithelial cells or between the cells and extracellular matrix, maintaining the structural integrity of the tissue.
Gap junctions provide intercellular passageways for the movement of ions and small molecules between cells, enabling communication and coordination of functions. Each of these junctions plays a vital role in the maintenance and functionality of the epithelial tissue, affecting things like tissue resilience, selective permeability, and cell communication.