1. How is osmosis different from facilitated diffusion?
Warm-UP
True or False? Passive Transport requires energy to move substances from high to low concentration.
How is osmosis different from facilitated diffusion?
What type of protein is used during facilitated diffusion. Why?
What are two things that diffusion, facilitated diffusion and osmosis share in common?
What is Homeostasis?

2. Active Transport, Endocytosis, and Exocytosis
KEY CONCEPT Cells use ENERGY to transport materials that cannot diffuse across a membrane.

3. Active Transport
Active transport requires energy from a cell and allows a cell to move a substance against its concentration gradient, from a region of lower concentration to a region of higher concentration
Active transport is powered by chemical energy (ATP).
Active transport occurs through transport protein pumps.
Cells use active transport to maintain homeostasis.
ATP

4. Endocytosis
A cell can also import and export large materials or large amounts of material in vesicles during the processes of endocytosis and exocytosis. Energy is required!
Endocytosis is the process of taking material into the cell such as liquids or fairly large molecules by engulfing (surrounding) them in a membrane.

5. Steps of Endocytosis
During Endocytosis, the cell membrane folds inward and fuses together. This surrounds the substance in a pocket.
The pocket pinches off inside of the cell, forming a vesicle.
The vesicle fuses with a lysosome or similar vesicle. Then, enzymes break down the membrane AND the contents inside!

6. Phagocytosis
Phagocytosis is a type of endocytosis where the cell membrane engulfs large particles.
Phagocytosis actually means “cell eating.”
It plays a key role in our immune systems.
How? Some white blood cells in the human body are called macrophages. Their purpose is to help fight infection.
They seek out foreign materials in the body, such as bacteria and engulf and destroy them!

7. Exocytosis
Exocytosis is the opposite of endocytosis. It is the release or expelling of substances out of a cell by the fusion of a vesicle WITH the membrane.

8. Steps of Exocytosis
The cell forms a vesicle around material that needs to be expelled from the cell.
The vesicle is transported to the cell membrane.
The vesicle membrane fuses with the cell membrane and releases the contents from the cell.

9. How is endocytosis different from exocytosis?
Diffusion
True or False? Active Transport requires no energy to move substances from high to low concentration.
How is endocytosis different from exocytosis?
What type of protein is used during active transport.
What are two things that active transport, endocytosis and exocytosis share in common?

10. EXIT TICKET
How do transport proteins that are pumps differ from those that are channels?
Protein channels do not use energy and move substances by diffusion from high to low concentration. Protein Pumps use energy.
2. How do endocytosis and exocytosis differ from diffusion?
Endocytosis and exocytosis use energy to take substances in or out of the cell. Diffusion does not require the cell to use energy.
3. Which picture shows endocytosis? Exocytosis?
4. During diffusion molecules tend to move _____________________
5. The diffusion of water across a selectively permeable membrane is called ________.
6. ______________ transport requires energy from ATP to move substances across
7. All of the following are kinds of passive transport EXCEPT _________.
Down with the concentration gradient
osmosis
Active
Protein pump