1. November 17, 2015 Bell Work: Can all objects move into cells?
Objective:
The student will be able to…
Define cellular transport with 100% accuracy using notes and classroom activities.

2. Today in History
1869 The Suez Canal opened in Egypt, linking the Mediterranean and the Red seas.
2003 Actor Arnold Schwarzenegger was sworn in as governor of California.

3. Cell Membrane Phospholipid bilayer Selectively permeable
Lipid: phosphate group and two fatty acids
Selectively permeable
Semi-permeable

4. Cell Transport

5. Cellular Transport
The movement of ions or molecules across a cell membrane
a movement of biochemicals and other atomic or molecular substances across cell membranes.

6. Passive Transport
Diffusion
Osmosis

7. Concentration Gradient
A difference in concentration of a substance across a space

8. Equilibrium
A condition in which the concentration of a substance is equal throughout a space

9. Diffusion
The movement of a substance from an area of high concentration to an area of low concentration caused by the random motion of particles

10. Diffusion

11. Osmosis
The diffusion of water across a selectively permeable membrane

12. Osmosis

13. Diffusion and Osmosis

14. Hypertonic Water diffuses out of the cell
Fluid outside of the cell has a higher concentration of dissolved particles than fluid inside the cell
Lower free water molecule concentration than cytosol
Cell shrinks

15. Hypotonic Water diffuses into the cell
Fluid outside the cell has a lower concentration of dissolved molecules than fluid inside the cell
Higher free water concentration than cytosol
Cell swells

16. Isotonic No net water movement
Concentration of free water molecules is the same inside and outside of the cell
Same free water concentration as cytosol
Cell stays the same size

17. Crossing the Cell Membrane
Most ions and polar molecules cannot pass across the cell membrane
They cannot pass through the nonpolar interior of the lipid bilayer
Transport proteins called channels provide polar passageways that allow ions and polar molecules to move across the cell membrane.
Each channel only allows a specific substance through

18. Crossing the Cell Membrane
Ion channel
Transport protein that has a polar pore which ions can pass through
Some are always open
Others the pores can be closed by ion channel gates

19. Ion Channel

20. Facilitated Diffusion
A type of passive transport that moves substances down their concentration gradient without using the cells energy.
Carrier proteins: transport proteins that can bind to a substance on one side of the cell, carry the substance to the other side of the cell, and release it.

21. Facilitated Diffusion
Carrier protein binds a specific molecule on one side of the cell membrane
A change in shape of the carrier protein exposes the molecule to the other side of the cell membrane
The carrier protein shields the molecule from the interior of the lipid bilayer. The molecule is then released from the carrier proteins which then returns to its original shape.

22. Facilitated Diffusion

23. Vocabulary Worksheet
Write the definitions of the key terms used in today’s lesson.

24. Graded Papers

25. Ticket Out
What is passive transport?