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Facilitated Diffusion

Published byClifford Ferguson Modified over 5 years ago

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Presentation on theme: "Facilitated Diffusion"— Presentation transcript:

1 Facilitated Diffusion
Active transport Facilitated Diffusion Active Transport Diffusion ATP Passive Transport

2 Active Transport Does this kayaker need to spend his energy in order to move?

3 Active Transport Defined: Molecules move from a LOW to a HIGH concentration Against (up) the concentration gradient ATP energy opens/closes protein channel ATP = Adenosine Triphosphate Acts like a pump for ions ATP

4 Active Transport Video

5 Contractile vacuole of a Paramecium
The contractile vacuole pumps out the excess water. This is an example of active transport. Water diffuses into the Paramecium… . . . . . . . . . . . . . . . . . . . . . . Paramecium . . . . . . . . . . . Contractile vacuole . . . . . . . . . . . . . . . . . Paramecia live in watery environments… Lets zoom in… The contractile vacuole… contracts… to squirt excess water out If too much water diffuses into the Paramecium, it could burst and die… . . . . . . . Very similar to a bilge on a boat . . . . . . . . . . .

6 Endocytosis Endocytosis: Process in which the plasma membrane takes in substances (2 types) 1) Phagocytosis: when a cell engulfs a solid particle WBCs are called phagocytes 2) Pinocytosis: when a cell engulfs a liquid particle

7 Endocytosis & the lysosome
The bacteria is engulfed by phagocytosis The bacteria is placed inside a lysosome are destroyed

8 Endocytosis Endocytosis: Process in which the plasma membrane takes in substances (2 types) 1) Phagocytosis: when a cell engulfs a solid particle WBCs are called phagocytes 2) Pinocytosis: when a cell engulfs a liquid particle Unfortunately, viruses can also enter our cells this way receptor virus virus virus virus DNA

9 Exocytosis Defined: Process when substances are expelled from the cell
Proteins, nutrients, and waste exit by exocytosis Vesicle carry & release objects through the plasma membrane

10 Review How are active and passive transport different? Similar?
Which molecule powers active transport? How are endo- and exocytosis similar? Different? Which cell part controls active transport? Once inside a cell, what actually kills bacteria that have been swallowed by endocytosis? During exocytosis, which organelle fuses with the cell membrane? What are the types of endocytosis?

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