1. 3.5 Active Transport, Endocytosis, and Exocytosis
KEY CONCEPT Cells use energy to transport materials that cannot diffuse across a membrane.

2. Maintains homeostasis!
Active Transport
Defined: Molecules move from a LOW to a HIGH concentration
ATP energy opens/closes protein channel
ATP = Adenosine Triphosphate
Occurs through protein pumps
Maintains homeostasis!

3. 3.5 Active Transport, Endocytosis, and Exocytosis
A cell can import and export large materials or large amounts of material in vesicles during the processes of endocytosis and exocytosis.
Cells use energy to transport material in vesicles.
Endocytosis is the process of taking material into the cell.

4. Endocytosis 2 types of endocytosis:
1) Phagocytosis: when a cell engulfs a solid particle
2) Pinocytosis: when a cell engulfs a liquid particle
Unfortunately, viruses can also enter our cells this way

5. Endocytosis & the lysosome

6. Amoeba and endocytosis

7. 3.5 Active Transport, Endocytosis, and Exocytosis
Exocytosis is the process of expelling material from the cell.

8. Exocytosis Proteins, nutrients, and waste exit by exocytosis
Vesicle carry & release objects through the plasma membrane

9. Contractile vacuole of a Paramecium
Water being pumped out of this cell to prevent bursting

10. Quick Review
Diffusion is the movement of particles from high to low concentrations
Some methods of movement don’t require energy (Passive Transport)
Some methods of movement require energy (Active transport)
Farts smell because of diffusion