No Bellringer This Week
Agenda <ul><li>NOTES: Membrane Transport </li></ul><ul><ul><li>Membrane Structure </li></ul></ul><ul><ul><ul><li>Fluid-Mos...
Function of the Cell Membrane <ul><li>All cells are surrounded by a thin, flexible barrier known as the cell membrane. </l...
Structure of the Cell Membrane <ul><li>The structure of the membrane is sometimes described by the “fluid-mosaic” model. <...
 
 
 
The Lipid Bilayer <ul><li>Membranes are made of a double-layered sheet of phospholipids called the lipid bilayer. </li></u...
 
 
 
 
Solutions <ul><li>A solution is a mixture of a liquid and solid. </li></ul><ul><ul><li>The liquid is called the solvent </...
Diffusion <ul><li>When substances are dissolved in a solution they will spread out evenly. </li></ul><ul><li>This process ...
 
 
 
Diffusion Gradient <ul><li>When a substance is clumped in one area we say that it has a high concentration, while the area...
Passive Transport <ul><li>Diffusion moves molecules in and out of the cell </li></ul><ul><li>This takes no energy so it’s ...
 
BrainPOP: Passive Transport
 
Osmosis <ul><li>Osmosis is the diffusion of water </li></ul><ul><li>The Rule for Osmosis is “SALT SUCKS” </li></ul><ul><ul...
 
Osmosis Terminology <ul><li>Isotonic – the concentration of solutes is the same inside and outside of the cell </li></ul><...
 
Effects of Osmosis on Cells <ul><li>If a cell is placed into a Hypertonic solution, the solutes outside the cell will suck...
 
 
 
Assignment <ul><li>19 Review Questions </li></ul><ul><li>Due Tomorrow </li></ul>
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Passive Transport

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  • This diagram represents what happens to a red blood cell and plant cell under different solute concentrations. Hypertonic  higher external solute concentration than within the cell so water moves out of the cell Isotonic  equal solute concentrations within and without Hypotonic  higher internal solute concentration that outside of cell so water moves into cell QUESTION #5: Why doesn’t the plant cell burst under hypotonic conditions like the red blood cell?
  • Passive Transport

    1. 1. No Bellringer This Week
    2. 2. Agenda <ul><li>NOTES: Membrane Transport </li></ul><ul><ul><li>Membrane Structure </li></ul></ul><ul><ul><ul><li>Fluid-Mosaic Model </li></ul></ul></ul><ul><ul><ul><li>Phospholipid Structure </li></ul></ul></ul><ul><ul><li>Diffusion </li></ul></ul><ul><ul><ul><li>Solutions </li></ul></ul></ul><ul><ul><ul><li>Diffusion Gradient </li></ul></ul></ul><ul><ul><li>Osmosis </li></ul></ul><ul><ul><ul><li>Isotonic, Hypertonic, and Hypotonic Solutions </li></ul></ul></ul><ul><ul><ul><li>Cell Shrinking or Bursting </li></ul></ul></ul>
    3. 3. Function of the Cell Membrane <ul><li>All cells are surrounded by a thin, flexible barrier known as the cell membrane. </li></ul><ul><li>In order for a cell to live, molecules must be able to get in and out of the cell. </li></ul><ul><li>Small molecules (like water) are able to pass directly through the membrane, while large molecules require some help. </li></ul>
    4. 4. Structure of the Cell Membrane <ul><li>The structure of the membrane is sometimes described by the “fluid-mosaic” model. </li></ul><ul><li>This is because the membrane is composed of many different types of molecules. </li></ul><ul><ul><li>Lipids </li></ul></ul><ul><ul><li>Protein </li></ul></ul><ul><ul><li>Carbohydrates </li></ul></ul>
    5. 8. The Lipid Bilayer <ul><li>Membranes are made of a double-layered sheet of phospholipids called the lipid bilayer. </li></ul><ul><li>This bilayer is “selectively permeable”, meaning it lets some molecules through, but not others. </li></ul><ul><li>Phospholipid molecules have 2 parts: </li></ul><ul><ul><li>Hydrophilic Head (Polar, Attracted to Water) </li></ul></ul><ul><ul><li>Hydrophobic Tails (Nonpolar, Repelled by Water) </li></ul></ul>
    6. 13. Solutions <ul><li>A solution is a mixture of a liquid and solid. </li></ul><ul><ul><li>The liquid is called the solvent </li></ul></ul><ul><ul><li>The solid is called the solute </li></ul></ul><ul><li>For example, in a solution of saltwater: </li></ul><ul><ul><li>Water = Solvent </li></ul></ul><ul><ul><li>Salt = Solute </li></ul></ul>
    7. 14. Diffusion <ul><li>When substances are dissolved in a solution they will spread out evenly. </li></ul><ul><li>This process of spreading is called diffusion. </li></ul><ul><li>Diffusion requires no energy because it is based on the random movement of molecules. </li></ul><ul><li>Examples: </li></ul><ul><ul><li>If you add a single drop of food coloring to a glass of water, the color will spread through the whole glass. </li></ul></ul><ul><ul><li>If someone farts on one side of the room, the smell spreads out to everyone around him. </li></ul></ul>
    8. 18. Diffusion Gradient <ul><li>When a substance is clumped in one area we say that it has a high concentration, while the area with less substance has a low concentration. </li></ul><ul><li>Diffusion always moves a substance from areas of High Concentration to Low Concentration. </li></ul><ul><li>This tendency to move from high to low is called “following the concentration gradient”. </li></ul><ul><ul><li>High Concentration  Low Concentration </li></ul></ul>
    9. 19. Passive Transport <ul><li>Diffusion moves molecules in and out of the cell </li></ul><ul><li>This takes no energy so it’s called “Passive Transport” </li></ul><ul><li>Diffusion Example </li></ul><ul><ul><li>As the cell uses oxygen the concentration inside the cell drops. More oxygen flows in from the high concentration outside of the cell. </li></ul></ul><ul><ul><li>As carbon dioxide builds up inside the cell, this high concentration causes molecules to flow towards the lower concentration outside the cell. </li></ul></ul>
    10. 21. BrainPOP: Passive Transport
    11. 23. Osmosis <ul><li>Osmosis is the diffusion of water </li></ul><ul><li>The Rule for Osmosis is “SALT SUCKS” </li></ul><ul><ul><li>Inside of the cell is salty = sucks water in </li></ul></ul><ul><ul><li>Outside of the cell is salty = pulls water out </li></ul></ul>
    12. 25. Osmosis Terminology <ul><li>Isotonic – the concentration of solutes is the same inside and outside of the cell </li></ul><ul><li>Hypertonic – the higher concentration of solute </li></ul><ul><li>Hypotonic – the lower concentration of solute </li></ul><ul><li>If there is less solute inside the cell then you would say that the cell is Hypotonic and the outside of the cell is Hypertonic. </li></ul>
    13. 27. Effects of Osmosis on Cells <ul><li>If a cell is placed into a Hypertonic solution, the solutes outside the cell will suck out water and cause the cell to shrivel. </li></ul><ul><li>If a cell is placed into a Hypotonic solution, the solutes inside the cell will attract water and cause the cell to burst. </li></ul><ul><li>Note that plant cells will not burst because the membrane pushes up against the cell wall. </li></ul>
    14. 31. Assignment <ul><li>19 Review Questions </li></ul><ul><li>Due Tomorrow </li></ul>

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