Indicate whether each of the following statements is likely…
Indicate whether each of the following statements is likely to be true or false. Because tight junctions seal the plasma membrane of adjacent epithelial cells together, there is no material exchange between the intestinal lumen and the extracellular fluid on the other side of the epithelial sheet. Actin polymerization is required for adherent cells to move on a surface. Gap junctions are important structures for coupling the electrical and metabolic activities of adjacent cells. While moving, an adherent cell generates a membrane protrusion stabilized by the formation of focal contacts that adhere the cell membrane to the surface. Extracellular matrix plays an important role in tissue formation and regeneration. No contraction force is needed for an adherent cell to move on a surface. “Adhesion belts” contain bundles of actin filaments connected across the epithelial cells via integrins and associated proteins.