1. Cellular transport
How are cells able to control what enters and what leaves the cell while maintaining homeostasis?

2. Two types of cellular transport
Active Transport
Passive Transport
Cell uses energy
Cell does not use energy

4. Passive transport Molecules move randomly
Molecules move from areas of high concentration to low concentration
Molecules move without use of energy

6. Types of passive transport
Simple Diffusion
Facilitated Diffusion
Osmosis

7. Passive transport – 1. simple diffusion
Random movement of particles from high concentration to low concentration
Continues until equilibrium is reached
Affected by: size of particles, concentration of particles, temperature

8. Passive transport – 2. facilitated diffusion
Diffusion of larger molecules through transport proteins within the membrane
-carrier or channel proteins
-transport proteins are specific – they only allow certain molecules to pass through the membrane
(EX: glucose, charged ions)
Channel Protein
Carrier Protein

9. Passive transport – 3. osmosis
Special type of diffusion where water will move through a selectively permeable membrane
Water moves from a high concentration to a low concentration

10. More about osmosis Three types of solutions Hypertonic Hypotonic
Solute: the substance that is dissolved in a solvent (EX: sugar)
Solvent: the substance the the solute is dissolved in (EX: water)
Solution: solute + solvent
Three types of solutions
Hypertonic
Hypotonic
Isotonic

11. Hypertonic solution
The solution has a higher concentration of solutes and a lower concentration of water than inside of the cell
Water moves out
Plasmolysis- cell shrinks

12. Hypotonic solution
The solution has a lower concentration of solutes and a higher concentration of water than inside of the cell
Cell takes in water
*Animal cells will swell and burst (cytolysis)

13. TURN AND TALK TO A PARTNER
An animal cell will swell and burst when placed into a hypotonic solution. When a plant cell is placed into a hypotonic solution, it will not. What prevents this from happening in the plant cell?

15. How Organisms Deal with Osmotic Pressure
A paramecium pumps water out through a contractile vacuole
Kidneys keep the blood isotonic by removing excess water.
Paramecium (protist) removing excess water video

16. Vacuoles store water in a plant cell
Osmotic (Turgor) pressure: pressure exerted by the movement of water during osmosis in a plant cell

17. isotonic solution
The concentration of solutes in the solution is equal to the concentration of solutes inside of the cell
Water moves in and out
*Dynamic Equilibrium

18. Osmosis practice problems

19. Think-Pair-Share
An IV is a direct infusion of liquid substances into a vein. Why would it be dangerous to give a person an IV infusion of distilled water?
What about 90% salt solution?

20. Think Independently:
In your spiral, write down what type of solution each cell was placed into: A: B: C:

21. Active transport Cell uses energy
Molecules are actively moved to where they are needed
Movement occurs from an area of low concentration to an area of high concentration

22. 3 Types of active transport
Protein Pumps
Endocytosis
Exocytosis

23. Active transport – 1. protein pumps
Protein pumps: transport proteins that require energy to do work
EX: Sodium/Potassium Pump
The protein must change shape to move molecules across the membrane : requires energy

24. Active transport – 2. endocytosis
Phagocytosis
Taking particles into the cell
Requires energy
How the cell “eats”

25. Endocytosis- Amoebas eating lunch

26. Active transport – 2. endocytosis
Pinocytosis
Taking liquid into the cell
Requires energy
How the cell “drinks”

27. Active transport – 3. exocytosis
Type of active transport where the cell transports molecules out of the cell
Requires energy

28. DRAW a flow chart for cellular transport

29. CELLULAR TRANSPORT ACTIVE TRANSPORT PASSIVE TRANSPORT EXOCYTOSIS
FACILITATED
DIFFUSION
PROTEIN PUMPS
SIMPLE
DIFFUSION
OSMOSIS
ENDOCYTOSIS
PHAGOCYTOSIS
PINOCYTOSIS