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Gap junctions and plasmodesmata are specialized sites of communication between adjoining cells in animals and plants respectively. Gap Junctions Gap junctions readily allow the passage of small molecules and ions required for rapid communication (such as heart tissue), but do not allow the passage of larger molecules such as proteins Gap Junction
IX. 3 Types Of Cell Junctions Found In Animal Tissues A. tight junctions 1. neighboring cells held tightly together via proteins 2. prevent leakage B. desmosomes (anchoring junctions) 1. function like rivets to hold cells together in strong sheets 2. common in tissues subject to stretching or mechanical stress a. skin & muscle C. gap junctions 1. are communicating junctions 2. protein lined pores 3. allow small molecules to flow between adjacent cells a. ions of heart cells to coordinate contraction b. enable embryo cells to communicate â¢ A desmosome forms a very strong spot weld between cells. It is created by the linkage of cadherins and intermediate filaments. (credit: modification of work by Mariana Ruiz Villareal)