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Biology 311C Lecture 14 - Biology 311C Lecture 14 At tight...

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September 26, 2011 Biology 311C Lecture 14 At tight junctions, membranes of neighboring cells are pressed together, preventing leakage of extracellular fluid. Desmosomes (anchoring junctions) fasten cells together into strong sheets. Gap junctions (communicating junctions) provide cytoplasmic channels between adjacent cells. The ECM acts like a cell wall in that it is made out of carbs and proteins and within in it is collagen. Coming off the desosomes are filaments. The cell junctions that are particularly important for the functions of cardiac muscle cells are gap junctions. They are important because the movement of ions plays a role in the cell contracting. The cell junctions that are particularly important for the functioning of desmosomes. They are intercellular junctions that tightly connect two cells together. There is a lot of force on those cells. The cell junctions that are particularly important for the functioning of intestinal cells are tight junctions so that it doesn’t leak. You also don’t want outside liquids going in.
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