Facilitated diffusion
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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). How does active transport differ from diffusion?.

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FACILITATED DIFFUSION

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Facilitated diffusion

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)


How does active transport differ from diffusion

How does active transport differ from diffusion?


Active transport

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


Bulk transport endocytosis

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)


Types of endocytosis

Types of Endocytosis

  • Pinocytosis: solutes or fluids (cellular drinking)

  • Phagocytosis: large particles, cells (cellular eating)


Bulk transport exocytosis

Bulk Transport-Exocytosis

  • Reverse of Endocytosis

  • Vesicles fuse w/membrane, releasing contents

  • Ex: releasing proteins like insulin (animation)


Important

IMPORTANT!!!

  • Active transport & ALL forms of Bulk transport requireenergy!


Can you

Can you???

  • Distinguish between passive and active transport

  • Explain why facilitated diffusion is a type of passive transport

  • Describe the difference between a hypertonic, hypotonic and isotonic environment

  • Compare/Contrast endocytosis and exocytosis

  • Describe the structure of the cell membrane & a phospholipid


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