1 / 16

ACTIVE TRANSPORT

ACTIVE TRANSPORT. Remember…. Passive Transport does NOT require energy Types of passive transport: Diffusion Facilitated Diffusion Osmosis . Active Transport . Requires energy! Molecules move against their concentration gradients (from LOW concentration to HIGH )

raiden
Download Presentation

ACTIVE TRANSPORT

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. ACTIVE TRANSPORT

  2. Remember…. • Passive Transport does NOT require energy • Types of passive transport: • Diffusion • Facilitated Diffusion • Osmosis

  3. Active Transport • Requires energy! • Molecules move against their concentration gradients (from LOW concentration to HIGH) • Cells use energy to power this process • Two types: Endocytosis and Exocytosis

  4. Active transport • Uses energy to move solutes against their [ ] gradients across the cell membrane • Energy required  usually ATP • Carrier proteins are used…NEVER channel proteins • Ex: sodium-potassium pump

  5. Passive vs. Active Transport Figure 7.17

  6. Sodium Potassium Pumps (Active Transport using proteins) 1. PROTEIN PUMPS • Protein Pumps-transport proteins that require energy to do work • Examples: • Na+/K+ Pumps are important in nerve responses • Antiports and Symports (Cotransport) • H+ (proton) pump Protein changes conformational shape to move molecules: this requires energy!

  7. 2. Bulk transport across the plasma membrane • Occurs by exocytosis and endocytosis • BOTH MOVE “BIG” AMOUNTS OF STUFF in OR out OF THE CELL

  8. Exocytosis • USES ENERGY! • Moves “BIG” materials OUT of the cell • Vesicle moves to the plasma membrane and fuses with it, contents are emptied from the cell • “exo-” means “exit” • Ex: hormone excretion; nerve cells and transmitters; removal of wastes

  9. Exocytosis

  10. 1 ROUGH ER Glycolipid 2 Vesicle 3 4 Secreted protein Membrane glycolipid ER GOLGI APPARATUS

  11. Endocytosis • USES Energy! • Brings “BIG” materials INTO the cell • Cell takes in macromolecules by forming new vesicles from the plasma membrane • “endo-” means “enter”

  12. Endocytosis

  13. 2 types of Endocytosis 1. Phagocytosis • “cell eating” • Cell engulfs SOLIDS into vesicle & “digests” it 2. Pinocytosis(think “pineapple juice) • “cell drinking” • Cell engulfs LIQUIDS into vesicle & “digests” it

  14. Additional Notes T- CHART • Passive Transport • NO ENERGY NEEDED • THREE SUB UNITS • Osmosis • Diffusion • Facilitated Diffusion • 3. HIGH to LOW • 4. SMALL MOLECULES • Active Transport • YES! ENERGY NEEDED • TWO SUB UNITS • Exocytosis • Endocytosis • 3. LOW to HIGH • 4. BIG MOLECULES

More Related