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Cell Size

Cell Size. Cell Size. Cells size is limited by diffusion Nutrients must reach all areas of cell. Waste from all of cell must be able to leave without poisoning other parts. Small cells are more efficient then large. Surface area to volume ratio is key

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Cell Size

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  1. Cell Size

  2. Cell Size • Cells size is limited by diffusion • Nutrients must reach all areas of cell. • Waste from all of cell must be able to leave without poisoning other parts. • Small cells are more efficient then large.

  3. Surface area to volume ratio is key • Too Large a ratio – unable to diffuse quick enough.

  4. Relative Concentrations

  5. Hypertonic • Cells in solutions that cause water to leave the cell. • Cell shrinks in size.

  6. Isotonic • Solution that is at equilibrium with the cell. • Same concentration in and out of cell. • Cell maintains its shape/size.

  7. Hypotonic • Cells in a solution that cause water to enter the cell. • Cells swell • Cells may burst – LYSE.

  8. Endocytosis • Movement of materials into a cell by a vesicle. • “Cell Eating” • Membrane bound vesicles.

  9. Exocytosis • Movement of a substance to the outside of a cell. • Membrane bound vesicles. • Vesicles bind to membrane. • Used for export of proteins, etc…

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