![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/student_view0/
chapter2/animation__how_osmosis_works.html](https://image.slidesharecdn.com/diffusion-and-osmosis-241201124736-be53680f/85/diffusion-and-osmosis-a-simple-introduction-ppt-4-320.jpg)
![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]
Isotonic
Hypotonic
Hypertonic
Part 3 pg. 85](https://image.slidesharecdn.com/diffusion-and-osmosis-241201124736-be53680f/85/diffusion-and-osmosis-a-simple-introduction-ppt-5-320.jpg)
diffusion-and-osmosis a simple introduction.ppt
- 2. 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/ student_view0/chapter2/ animation__how_diffusion_works .html 2 3 1 4 (water)
- 4. 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/student_view0/ chapter2/animation__how_osmosis_works.html
- 5. 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] Isotonic Hypotonic Hypertonic Part 3 pg. 85
- 6. Osmosis in Living Cells Cellulose in cell wall
- 7. Osmosis in Red Blood Cells Isotonic Hypotonic Hypertonic • 0.9% saline 10% NaCl Distilled water Predictions? Plasmolysis
- 8. Osmosis in Plant Cells •. 10% NaCl Distilled water Hypertonic Hypotonic Predictions? Plasmolysis
- 9. Animations Dialysis Bag Experiment • http://ccollege.hccs.cc.tx.us/instru/Biology/ AllStudyPages/Diffusion_Osmosis/Baggif.swf Elodea Cell • http://ccollege.hccs.cc.tx.us/instru/Biology/ AllStudyPages/Diffusion_Osmosis/Elodeagif.swf Osmosis • http://ull.chemistry.uakron.edu/genobc/animations/ osmosis.mov
- 10. 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
- 11. Effect of Water on RBC