1. Aim: Active & Passive Transport
Enter Date
Aim: Active & Passive Transport
Warm-up:
What happened to the Gummy Bears?
HW:

2. What is a Cell Membrane?
A thin, flexible barrier found around the cell.
It regulates what enters and leaves the cell (selectively permeable)
It provides protection.
It provides support.

3. Structure of Cell Membrane
2 layers of FAT with some proteins thrown in
MAIN FUNCTION Controls what enters and exits the cell
Called a lipid bilayer

4. Cell membranes have pores (holes) in it Selectively permeable:
-Allows some molecules in and keeps other molecules out
Pores

5. Membrane Carbohydrates
Carbs are found attached to proteins like a long chain.
They help cells recognize each other.
This is the way cells communicate.

7. What does the cell membrane let through?
Small & Same molecules pass
Fats & gases can pass through

8. What can’t pass through?
Need Protein Channel (TUNNEL)
Dissolve d molecul es
Nutrien ts, & sugars

9. What can’t pass through?
Large molecules
Must be broken down first by digestion
Carbohydrates & Proteins

10. Types of Transport 2. Active Transport ATP needed
Passive Transport
No Energy (ATP) needed
High concentration  Low concentration
2. Active Transport
ATP needed
Low concentrat ion  High concentrat ion

11. Passive
Active

12. Which way will CO2 move?
Which way will O2 move?

13. Will Carbon dioxide go into or out of the cell?
GO OUT of CELL

14. Passive Transport -Movement of any substance from high to low
Diffusion
-Movement of any substance from high to low
Facilitated Diffusion
- Movement through protein pores
Osmosis
-Specifically the diffusion of water

15. Active Transport - Endocytosis
Phagocytosis
Cell engulfs solid particles
Energy needed
Larger particles

16. Active Transport - Endocytosis
Pinocytosis
Cell membrane buds a vessel
Energy needed, “cell drinking”
Liquids and small particles

17. Active Transport -Exocytosis
Removal of waste
Energy needed

19. Transport of Water in Cells
Place cell in SALT water
Water moves out of cell
Cell shrinks
Plant cell membrane now visible
Place cell in FRESH water
Water moves into cell
Cell swells
Animal cells could explode!

20. Normal Onion Cells
Salt Water Added
to Onion Cells

23. After being Place in Fresh Water