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Circulation in cells ok
- 2. Cell Membrane - Allows entry and exit of materials.
- 3. Outside of Cell Marker Protein Receptor Protein Carbohydrate chain Cell Membrane Channel Protein Lipid Inside of Cell
- 4. Cells move substances through the cell membrane by a process called transport Two Types of Transport: Passive Transport Active Transport
- 5. What is Passive Transport? Requires no energy from cell. Molecules move from high concentration to low concentration. Molecules move with the concentration gradient.
- 7. How would diffusion happen in a cell?
- 8. Osmosis is a type of diffusion. Cell Membrane
- 9. HELP WANTED! I’m a Channel, I can help!
- 11. How is Active Transport different? 1. Active transport requires energy. 2. Molecules move from low concentration to high concentration 3. Molecules move against concentration gradient.
- 12. Types of Transport - Passive transport - Diffusion – molecules from high to low - http://highered.mcgrawhill.com/sites/0072495855/student_view0/chapter2/animation__how_diffusion_works.html - Osmosis – water from high to low - http://highered.mcgrawhill.com/sites/0072495855/student_view0/chapter2/animation__how_osmosis_works.html - Active transport - http://highered.mcgrawhill.com/sites/0072495855/student_view0/chapter2/animation__how_facilitated_diffusion_works.html - Endocytosis – taking in - Phagocytosis – solids - http://highered.mcgrawhill.com/sites/0072495855/student_view0/chapter2/animation__phagocytosis.html - Pinocytosis - liquids - Exocytosis - Removal off
Notas del editor
- First ask the students if they know the answer. Click to bring in the picture of the cell membrane. Do not discuss all of the labeled structures. You may point out the different proteins (channel, marker, receptor).
- Ask the kids what the word transport means. (To move from one place to another). Cells need to move substances in and out in order to function.
- These are the three characteristics of passive transport. Concentration gradient – molecules flow with the movement of molecules. “Goes with the flow” – the different concentrations within a space.
- Have students explain what is happening in the animation. Starts out highly concentrated and moves (diffuses) to achieve equilibrium. You can use the analogy of having all 30 students sitting at one desk. They would all move to even themselves out.
- Tell the kids to watch the molecules moving across the membrane. Ask why they are moving. – to reach equilibrium. Notice that some molecules are disappearing (they are being used.)
- Ask what the “Mickey Mouse” molecules represent. - water (They should know this from previous powerpoints). Have the students explain to what is happening. Include movement from high to low.
- Facilitated Diffusion – channel proteins allows substances into the cell. Remember, the cell does not use energy during passive transport.
- This shows the movement of all different substances, which is “reality.” They do not “take turns.” Get the students to explain what is happening.
- Ask the students what the energy is - ATP