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Cellular Transport Figure 6-12 Both diffusion and facilitated diffusion are forms of passive transport, as neither process requires the cell to expend.

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Presentation on theme: "Cellular Transport Figure 6-12 Both diffusion and facilitated diffusion are forms of passive transport, as neither process requires the cell to expend."— Presentation transcript:

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2 Cellular Transport

3 Figure 6-12 Both diffusion and facilitated diffusion are forms of passive transport, as neither process requires the cell to expend energy. In facilitated diffusion, solute particles pass through a channel in a transport protein. Passive Transport – movement of substances without energy expended Passive Transport – movement of substances without energy expended

4 Movement across the Membrane Simple Diffusion Requires NO energy Molecules move from area of HIGH to LOW concentration

5 Diffusion – the movement of a substance from a high concentration to a low. Figure 6-11 Dye molecules diffuse across a membrane. At equilibrium, the concentration of dye is the same throughout the container.

6 Diffusion of Liquids

7 Facilitated Diffusion - is a process of diffusion facilitated (helped) by transport proteins

8 Osmosis – water transport across a membrane Hypertonic- solution with more substance than water concentration Isotonic – equal concentration of substance on both sides of the membrane Hypotonic – solution with less substance than water concentration

9 Isotonic Solution NO NET MOVEMENT OF H 2 O (equal amounts entering & leaving) Hypotonic Solution CYTOLYSIS Hypertonic Solution PLASMOLYSIS

10 Osmosis

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12 For a cell living in an isotonic environment (for example, many marine invertebrates) osmosis is not a problem. Similarly, the cells of most land animals are bathed in an extracellular fluid that is isotonic to the cells. Organisms without rigid walls have osmotic problems in either a hypertonic or hypotonic environment and must have adaptations for osmoregulation to maintain their internal environment.

13 Active Transport – requires energy to move molecules across a membrane Like an enzyme, a transport protein recognizes a specific solute, molecule or ion. During active transport, the protein uses energy, usually moving the solute in a direction from lesser concentration to greater concentration.

14 Transport of Large Molecules Vesicles Exocytosis Endocytosis


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