FACILITATED DIFFUSION A type of passive transport that does not require energy to move molecules...
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![Page 1: FACILITATED DIFFUSION A type of passive transport that does not require energy to move molecules down their concentration gradient uses membrane proteins.](https://reader035.fdocuments.us/reader035/viewer/2022062905/5a4d1adf7f8b9ab05997692b/html5/thumbnails/1.jpg)
FACILITATED DIFFUSION
• A type of passive transport that does not require energy to move molecules down their concentration gradient
• uses membrane proteins to move molecules across the membrane that are large or charged (ions)
![Page 2: FACILITATED DIFFUSION A type of passive transport that does not require energy to move molecules down their concentration gradient uses membrane proteins.](https://reader035.fdocuments.us/reader035/viewer/2022062905/5a4d1adf7f8b9ab05997692b/html5/thumbnails/2.jpg)
How does active transport differ from diffusion?
![Page 3: FACILITATED DIFFUSION A type of passive transport that does not require energy to move molecules down their concentration gradient uses membrane proteins.](https://reader035.fdocuments.us/reader035/viewer/2022062905/5a4d1adf7f8b9ab05997692b/html5/thumbnails/3.jpg)
Active Transport• Moves molecules from low
concentration to high concentration• Requires energy in the form of
ATP• Used to generate impulses
through nerve cells & to allow cells to continue to store nutrients
![Page 4: FACILITATED DIFFUSION A type of passive transport that does not require energy to move molecules down their concentration gradient uses membrane proteins.](https://reader035.fdocuments.us/reader035/viewer/2022062905/5a4d1adf7f8b9ab05997692b/html5/thumbnails/4.jpg)
![Page 5: FACILITATED DIFFUSION A type of passive transport that does not require energy to move molecules down their concentration gradient uses membrane proteins.](https://reader035.fdocuments.us/reader035/viewer/2022062905/5a4d1adf7f8b9ab05997692b/html5/thumbnails/5.jpg)
Bulk Transport-Endocytosis
• Cells ingesting (taking in) large particles, fluid, etc.• Membrane folds inward, makes a pouch, encloses material, and
membrane pinches off• Material is enclosed in a vesicle• Transported to lysosome for digestion, or to other organelles for
use (ex. WBC take in & destroy bacteria)
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Types of Endocytosis
• Pinocytosis: solutes or fluids (cellular drinking)• Phagocytosis: large particles, cells (cellular eating)
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Bulk Transport-Exocytosis
• Reverse of Endocytosis• Vesicles fuse w/membrane, releasing
contents• Ex: releasing proteins like insulin (
animation)
![Page 8: FACILITATED DIFFUSION A type of passive transport that does not require energy to move molecules down their concentration gradient uses membrane proteins.](https://reader035.fdocuments.us/reader035/viewer/2022062905/5a4d1adf7f8b9ab05997692b/html5/thumbnails/8.jpg)
IMPORTANT!!!• Active transport & ALL forms of
Bulk transport require energy!
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Can you???Distinguish between passive and active
transportExplain why facilitated diffusion is a
type of passive transportDescribe the difference between a
hypertonic, hypotonic and isotonic environment
Compare/Contrast endocytosis and exocytosis
Describe the structure of the cell membrane & a phospholipid