1 / 29

CELL TRANSPORT

CELL TRANSPORT. Courtesy of: http://www.prcity.com. Fluid Mosaic Model. Courtesy of: http://bio1151b.nicerweb.net/Locked/media/ch07/. Fluid Mosaic Model. Hydrophilic Heads. Hydrophobic tails. Courtesy of: http://bio1151b.nicerweb.net. Hydrophilic (water loving/ attracted to)

olisa
Télécharger la présentation

CELL 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. CELL TRANSPORT Courtesy of: http://www.prcity.com

  2. Fluid Mosaic Model Courtesy of: http://bio1151b.nicerweb.net/Locked/media/ch07/

  3. Fluid Mosaic Model Hydrophilic Heads Hydrophobic tails Courtesy of: http://bio1151b.nicerweb.net

  4. Hydrophilic (water loving/ attracted to) - phosphate heads Hydrophobic (water fearing/ Repelling) lipid tails Effects of polarity on permeability Polarity Courtesy of: http://img.sparknotes.comf

  5. Polarity Courtesy of: http://liquidbio.pbworks.com/f/phospholipid.jpg

  6. Types of Transport Courtesy of: http://www.google.com/imgres?imgurl=http://kentsimmons.uwinnipeg.

  7. Passive Transport • No energy (ATP) needed • High to low concentration • simple diffusion • facilitated diffusion • osmosis Courtesy of: http://www.arthursclipart.org

  8. Simple diffusion • Process by which molecules of a substance move from areas of higher concentration to areas of lower concentration. Courtesy of: http://www.dorlingkindersley-uk.co.uk

  9. Diffusion • first a concentration gradient is necessary, • diffusion occurs moving from higher to lower concentration • results in dynamic equilibrium,then • equal particles keep moving in each direction, no further change in concentration

  10. Osmosis • The diffusion of water through a selectively permeable membrane Courtesyof:http://www.hansonvanvleet.com

  11. Courtesy of: http://people.eku.edu

  12. Solutions • Hypotonic: below strength • solutions having lower concentrations of solutes outside the cell • Example: 15% salt outside of the cell and 20% inside. Which way will the water diffuse? • water leaves solution and goes into cell • Hypertonic: above strength • solutions having higher concentrations of solutes outside the cell • Example: 70% H2O inside the cell and 40% salt outside of the cell. • water leaves cells and goes into solution • Isotonic: equal strength • Solutions having equal concentrations of solutes inside and outside the cell • the same amount of water leaves the cell as the water that enters the cell

  13. Animal Cells (red blood cells) Courtesy of: http://www.google.com/imgres?imgurl=http://bio1151b.nicerweb.netnA.jpg&imgrefurl=http://bio1151b.nicerweb.net

  14. Osmotic Pressure • pressure exerted on hypertonic side of a semipermeable membrane • necessary to achieve equilibrium

  15. Plant Cells Courtesy of: http://bio1151b.nicerweb.net/Locked/media/ch07/water_balance-plants.html

  16. Turgor Pressure • main pressure of cell contents against the cell wall • determined by water content of the vacuole, resulting from osmotic pressure

  17. More on Plant Cell Osmosis • Turgid: • when in dilute solutions, • plant cell is swollen and hard • pressure is so high, no more water can enter • pressure works against osmosis • makes plants stand up • Flaccid • when in concentrated solutions • plant wilts • Plasmolyzed: • plasma membrane pulls away from cell wall due to loss of water • cell wall eventually collapses if not placed in a hypotonic solution

  18. Facilitated Diffusion • Carrier molecules (protein channels) assist in moving large particles from a high concentration to a low concentration • These particles fit through the membrane but are assisted Courtesy of: http://images.clipartof.com

  19. Facilitated Diffusion Courtesy of: http://www.google.com/imgres?imgurl=http://bio1151b.nicerweb.net

  20. energy needed moving from low to high concentration moving against the concentration gradient Active Transport Courtesy of: http://www.google.com/imgres

  21. Active Transport Courtesy of: http://bio1151b.nicerweb.net

  22. Endocytosis • process of taking material into the cell by means of infoldings of the cell membrane • these “pockets” break loose from the outer portion of the cell membrane and forms a vacuole (inside cytoplasm) • phagocytosis and pinocytosis

  23. Endocytosis Courtesy of: http://www.psc.edu

  24. Phagoyctosis • cell eating • extensions of cytoplasm surround a particle and package it within a food vacuole • the cell engulfs it • considered active transport • requires energy

  25. Phagocytosis Courtesy of: http://www.mrothery.co.uk/images/Image79.gif

  26. Pinocytosis • cell drinking • cells take up liquid from the surrounding environment • small pockets form along cell membrane • pockets fill with liquid • pockets pinch off to form vacuoles inside the cell

  27. Pinocytosis Courtesy of: http://media.photobucket.com

  28. Exocytosis • cells release large amounts of material from the cell • membrane of the vacuole surrounding material to be released fuses with cell membrane • forces material out of the cell

  29. Courtesy of: http://www.linkpublishing.com

More Related