1. CELLULAR TRANSPORT

2. Homeostasis and Transport
Homeostasis – the stable internal conditions of a living thing; maintaining a stable internal environment

3. Maintaining a Balance
Cells must keep the proper concentration of nutrients and water and eliminate wastes.
Cells die without homeostasis.
The plasma membrane is selectively permeable – it will allow some things to pass through, while blocking other things.

4. Passive Transport
No energy is used by the cell to transport molecules across the cell membrane
Molecules move along a concentration gradient – the difference in concentration of the molecules in a space.
Diffusion, osmosis and facilitated diffusion

5. Diffusion
Diffusion – the random movement of molecules from an area of high concentration to an area of low concentration until dynamic equilibrium is reached
Perfume, food coloring, O2, CO2

6. Osmosis
The diffusion of water across a selectively permeable membrane, from an area of higher concentration to an area of lower concentration until dynamic equilibrium is reached.

7. 3 types of solutions/cell environments
The direction of osmosis is determined by the type of solution a cell is in:
Hypertonic – the concentration of solute molecules is higher outside the cell than inside,
Hypotonic – the concentration is higher inside than outside, or
Isotonic – the concentration is the same

8. Cells in ISOTONIC solution

9. Cells in HYPOTONIC solution

10. Cells in HYPERTONIC solution

11. Contractile vacuoles Organelle found in freshwater protista.
Ameba, paramecium.
Collects excess water continuously entering organism by osmosis.
Vacuole bursts at cell surface expelling water without damaging the protista.

12. Facilitated Diffusion
A process in which substances move down their concentration gradient across the plasma membrane with the help of transport (carrier) protein molecules.
Sugars and amino acids

13. Active Transport
Movement of molecules and ions against the concentration gradient
Low  High
Energy is used
Transport proteins bind to ions, used energy to change shape, flipping ion into cell.
Minerals from soil to plant, iodine from blood to thyroid glands.

14. CELL TRANSPORT
PASSIVE
ACTIVE
DIFFUSION
OSMOSIS
FACILITATED DIFFUSION

15. TODDLE PIP
SAME TIME, SAME PLACE, FOR THE NEXT THRILLING INSTALLMENT!!