Diffusion and Osmosis

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Diffusion and Osmosis
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TSWBAT identify the process of osmosis and
diffusion via the gummi bear lab-analyze
diffusion through a sand baggie and apply the
concepts of hypotonic, hypertonic, and isotonic
to the activity

• On a blank sheet of paper
• Write the equation for cellular respiration.
• Where does cellular respiration occur in the
  cell?
• List the organelles that help to make proteins
• What is the difference between the rough and the
  smooth endoplasmic reticulum?

3
Diffusion

• Solvent what dissolve something
• Solute what is being dissolved
• Solute molecules moving from an area of high
  concentration to an area of low concentration
• Random motion drives diffusion
• Movement is based on kinetic energy (speed),
  charge, and mass of molecules
• Equilibrium is reached when there is an even
  distribution of solute molecules
• http//highered.mcgraw-hill.com/sites/0072495855/s
  tudent_view0/chapter2/animation__how_diffusion_wor
  ks.html

(water)
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Osmosis

• Diffusion of water through a semi-permeable
  membrane
• Semi-permeable permeable to solvents (WATER),
  but not to large molecules
• High water to low water
• Dissolved molecules (i.e. glucose, starch) are
  called solutes
• REMEMBER
• Water solvent
• Glucose, Starch solutes
• http//highered.mcgrawhill.com/sites/0072495855/st
  udent_view0/chapter2/animation__how_osmosis_works.
  html

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Effect of Water on Cells

• Hypertonic Environment
• High solute, low water
• The cell will shrink
• Plasmolysis cell death
• Hypotonic Environment
• High water, low solute
• Plants turgor pressure plant like this!!
• Animals cytolysis cell bursting
• Isotonic Environment
• water solute

Hypotonic
Hypertonic
Isotonic
Part 3 pg. 85
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Osmosis in Living Cells
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Osmosis in Red Blood Cells

• 0.9 saline
• 10 NaCl
• Distilled water

Plasmolysis
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Osmosis in Plant Cells
Plasmolysis

• .
• 10 NaCl
• Distilled water

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Animations

• Dialysis Bag Experiment
• http//ccollege.hccs.cc.tx.us/instru/Biology/AllSt
  udyPages/Diffusion_Osmosis/Baggif.swf
• Elodea Cell
• http//ccollege.hccs.cc.tx.us/instru/Biology/AllSt
  udyPages/Diffusion_Osmosis/Elodeagif.swf
• Osmosis
• http//ull.chemistry.uakron.edu/genobc/animations/
  osmosis.mov

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Transportation of Molecules

• Passive Transport
• Movement of molecules across a semi-permeable
  membrane
• no energy required
• Active Transport
• Movement of molecules across a semi-permeable
  membrane against a concentration gradient with a
  protein
• ENERGY ATP
• Facilitated Diffusion
• Movement of molecules across a semi-permeable
  membrane with a protein
• no energy required

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Effect of Water on RBC
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