KIN 2500 Chapter : KIN 2500 CHAPTER 3 NOTES Good
15 Mar 2019
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Cell junctions: cell junctions specialized point of contact between adjacent plasma membranes, there are five major types of cell junctions, 1. Tight junctions: water tight; stops things from going in between unless permeable to that; prevent substances from going from one cell to another cell membrane, 2. Adherens junctions: plaque baring; space in between pulling cells together; help epithelial cells resist separation. Desmosomes little bit wider space; keratin; plaque baring; intermediate filaments; found in skin and cardiac muscle - keeps it from stretching out and pulling apart. Keratinized cells dead cells found in linings of vagina and mouth. Non keratinized cells moist and living cells: 4. Hemidesmosomes: half of a desmosome; also plaque baring; connects or anchors a cell to an underlying (basement) membrane; intermediate filaments, 5. Gap junctions lots of space between membranes; connexons join two plasma membranes; communication going very quickly; permits electrical signals to cross from one membrane to another.
