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.
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 do 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.