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Membrane Transport&Membrane Potential
- 1. Membrane Transport and the Membrane Potential www.freelivedoctor.com
- 13. Diffusion Slide number: 1 www.freelivedoctor.com Solute Solvent
- 14. Diffusion Slide number: 2 www.freelivedoctor.com Solute Solvent
- 15. Diffusion Slide number: 3 www.freelivedoctor.com
- 16. Diffusion Slide number: 4 www.freelivedoctor.com
- 21. H 2 0 moves by osmosis into the lower H 2 0 concentration until equilibrium is reached (270 g/l glucose). www.freelivedoctor.com
- 33. Facilitated diffusion Slide number: 1 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Region of lower concentration Region of higher concentration www.freelivedoctor.com Cell membrane Protein carrier molecule Transported substance
- 34. Facilitated diffusion Slide number: 2 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Region of lower concentration Region of higher concentration www.freelivedoctor.com Cell membrane Protein carrier molecule
- 35. Facilitated diffusion Slide number: 3 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Region of lower concentration Region of higher concentration www.freelivedoctor.com Protein carrier molecule Transported substance
- 39. P Extracellular fluid 1. Three sodium ions (Na + ) and adenosine triphosphate (ATP) bind to the carrier protein. 2. The ATP breaks down to adenosine diphosphate (ADP) and a phosphate (P) and releases energy. 3 . The carrier protein changes shape, and the Na + are transported across the membrane. 4 . The Na + diffuse away from the carrier protein. 5 . Two potassium ions (K + ) bind to the carrier protein. 6 . The phosphate is released. 7 . The carrier protein changes shape, transporting K + across the membrane, and the K + diffuse away from the carrier protein. The carrier protein can again bind to Na + and ATP. Cytoplasm Na + ATP K + ADP 1 3 Na + Na + K + P K + 4 5 6 7 www.freelivedoctor.com Breakdown of ATP (releases energy) Carrier protein changes shape (requires energy) 2 Carrier protein resumes original shape ATP binding site Carrier protein
- 40. Extracellular fluid Three sodium ions (Na + ) and adenosine triphosphate (ATP) bind to the carrier protein. Cytoplasm Na + ATP www.freelivedoctor.com ATP binding site Carrier protein
- 41. P K + ADP Na + The ATP breaks down to adenosine diphosphate (ADP) and a phosphate (P) and releases energy. www.freelivedoctor.com Breakdown of ATP (releases energy)
- 42. K + Na + The carrier protein changes shape, and the Na + are transported across the membrane. www.freelivedoctor.com Carrier protein changes shape (requires energy)
- 43. The Na + diffuse away from the carrier protein. Na + www.freelivedoctor.com
- 44. Two potassium ions (K + ) bind to the carrier protein. K + www.freelivedoctor.com
- 45. The phosphate is released. P www.freelivedoctor.com
- 46. The carrier protein changes shape, transporting K + across the membrane, and the K + diffuse away from the carrier protein. The carrier protein can again bind to Na + and ATP. K + www.freelivedoctor.com Carrier protein resumes original shape