osmosis (2) - Movement of Materials Into and Out of Cells...

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Movement of Materials Into and Out of Cells Activity 1: Osmotic Concentration of Potato Cells, Student Resource Manual pages 35- 37 Activity 2: Red Blood Cells and Solute Diffusion, Student Resource Manual pages 24-26
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No quiz this week Next week lab will have combined quiz of Homeostasis and Osmosis lab Independent Projects: At least 3 ideas, which you want to test. Biological Significance Try to get new ideas
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Movement across the cell membrane Recall… one of the characteristics of life was “response to environment” Though we typically think of this as “moving” it can also apply to cells Organisms need to move material into and out of cells constantly How do cells respond to changes in the external environment?
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The Cell Membrane Functions: protect, separate, regulate Molecules have to pass into and out of a cell through the membrane It allows cells to control their internal chemical environment and the availability of important materials Structure: Phospholipid Bilayer Selectively Permeable http://www.biologycorner.com O 2 , CO 2 H 2 O and other small, non- polar molecules glucose and other large, polar, water- soluble molecules; ions (H+, Na+, K+, CA++, CI–) Phosphorous Lipids
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Osmosis NET Flow of H 2 O Flow of H 2 O Diffusion Diffusion: Spontaneous NET movement of particles from an area of high solute concentration to an area of low concentration in a given volume of fluid (liquid or gas) Osmosis: Spontaneous NET movement of water through a cell wall or membrane or any semi-permeable barrier from an area of low solute concentration to an area with high solute concentration Water Solute Objective: Balance concentrations on both sides of the membrane Movement across the Cell Membrane Passive transport
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Concentration Gradients Hypertonic Solution : contains a high solute concentration relative to another solution. Hypotonic Solution : contains a low solute concentration relative to another solution. Isotonic Solution : contains an equal solute concentration relative to another solution. When we talk about levels of concentration , we are talking about relative amounts of solute .
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Concentration Gradients- Osmosis Osmosis in a HYPOTONIC/HYPERTONIC environment Flow of H 2 O NET Flow of H 2 O HYPERTONIC HYPOTONIC * Remember, the terms “hypertonic”, “hypotonic” and “isotonic” are relative terms. A solution can only be hypotonic compared to something else.
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