Feb_2_MEMBRANES_AND_OSMOSIS

Feb_2_MEMBRANES_AND_OSMOSIS - MEMBRANES AND OSMOSIS...

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MEMBRANES AND OSMOSIS Membrane Structure o Barrier to keep things in place inside the cell o Membranes form when phospholipids are present o 1 phospholipid has two tails with one head o Glycoprotein and glycolipids are on the surface of the cell and helps to provide recognition o Cholesterol makes membranes more fluid so they are not stiff. Allows bending of membranes o Matrix- fills up space in our cells around bones, is hard, around cheeks is soft o Move signals from outside to inside of cell-> messenger molecule stays outside of cell and binds to a specific receptor. Message gets into cell. Steroids are lipid soluble and can enter o Mitochondria are good for ATP formation Passive Transport/Active Trasport/Osmosis o Differential permutation- large molecules cannot get through membranes, medium can sometimes, small molecules get through membrane easily. Molecules evenly distributed o Facilitated diffusion-membranes recognize molecules and can move molecules in and out easily. (requires protein) molecules evenly distributed.
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Feb_2_MEMBRANES_AND_OSMOSIS - MEMBRANES AND OSMOSIS...

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