LIFESCI 2 Lecture Notes - Lecture 7: Dentate Gyrus, Fluid Mosaic Model, Lipid Bilayer
Document Summary
Fluid mosaic model: phospholipid layer, bilayer = lake in which proteins float, choline, phosphate, glycerol, and two hydrocarbon chains, hydrophilic head = choline, phosphate (pos and neg charge) Pos charged choline faces water, neg charged phosphate faces tails: hydrophobic tail = glycerol, chains, naturally organize in water lipid composition may change due to lipids. Phospholipids vary in fatty acid chain length. Dentate gyrus makes new neurons: new neuron inserted thru modification of fatty acid chain length. Theory: weakening of tight junctions lead to death: desmosomes link adjacent cells tightly but allow materials to move around them in intercellular space. Hold together intermediate filaments i. e. keratin: gap junctions. Gap junction + memory inhibitors found in skin, neurons. Atria/ventricle connected to gap junction to coordinate activity important for speed, coordinated activity. Smooth muscles in small intestine use gap junction to move bolus. Binds to matrix outside epithelial cells, actin filaments inside cell. Depends on # of solute particles not type of particles.
