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Cellular Transport

Cellular Transport. Osmosis, Diffusion, and Limits on Cell Size. Osmosis. Defined: diffusion of water across a selectively permeable membrane . Isotonic Solution. Concentration of solute is equal to cell’s concentration. Solution: a homogeneous mixture of two or more substances

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Cellular Transport

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  1. Cellular Transport Osmosis, Diffusion, and Limits on Cell Size

  2. Osmosis Defined: diffusion of water across a selectively permeable membrane.

  3. Isotonic Solution Concentration of solute is equal to cell’s concentration. Solution: a homogeneous mixture of two or more substances Solute: dissolved matter in a solution Solvent: liquid that dissolves the solute Homogeneous: all of the same kind

  4. Hypotonic Solution Concentration of solute is less than cell’s concentration.

  5. Hypertonic Solution Concentration of solute is greater than cell’s concentration.

  6. Plant Cells in hypo, iso, and hyper

  7. Passive Transport • No energy required • From greater to lesser concentration • Travels with the concentration gradient • Gradient: difference in magnitude of a substance

  8. Facilitated Diffusion No energy required Carrier protein required

  9. Facilitated Diffusion cont. Works faster than diffusion

  10. Active Transport Against concentration gradient Energy and carrier protein are required

  11. Large Particles Endo[in]cytosis and exo[out]cytosis

  12. Limits on Cell size • Diffusion • DNA and cell processes • Surface area to volume ratio • Temperature regulation • Gas exchange • Waste disposal

  13. High surface area to volume Tardigrade

  14. Low surface area to volume Giant Isopod

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