active transport ch 7.3
TRANSCRIPT
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Active TransportActive Transport
Chapter 7-3 Chapter 7-3
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Active Transport Active Transport
Remember: in diffusion, solute molecules Remember: in diffusion, solute molecules move from HIGH conc. move from HIGH conc. LOW conc. LOW conc.
But sometimes, it is necessary to move But sometimes, it is necessary to move solute molecules against the concentration solute molecules against the concentration gradient!! gradient!!
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Active TransportActive Transport
Active Transport: Active Transport: often involves often involves movement of solute movement of solute molecules from molecules from
LOW concentration LOW concentration HIGH concentrationHIGH concentration
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Active Transport Active Transport
Active transport requires Active transport requires ENERGY!!!! ENERGY!!!!
What kind of energy do you think active What kind of energy do you think active transport uses?? Hint: it’s the product of transport uses?? Hint: it’s the product of cellular respiration cellular respiration
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Active Transport: ProteinsActive Transport: Proteins
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Comparison of Cellular TransportComparison of Cellular Transport
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Transport by the Cell MembraneTransport by the Cell Membrane
Some larger molecules can only be Some larger molecules can only be transported into and out of the cell by transported into and out of the cell by movement of the cell membrane itself! movement of the cell membrane itself!
Examples: endocytosis, exocytosisExamples: endocytosis, exocytosis
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Active Transport: EndocytosisActive Transport: Endocytosis
Endocytosis: process of taking material Endocytosis: process of taking material intointo the cell by means of infoldings of the the cell by means of infoldings of the cell membrane cell membrane
Food, molecules, even whole cells are Food, molecules, even whole cells are “consumed” by the cell via endocytosis“consumed” by the cell via endocytosis
Examples: phagocytosis, pinocytosisExamples: phagocytosis, pinocytosis
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EndocytosisEndocytosis
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PhagocytosisPhagocytosis
Phagocytosis means “cell eating”; method Phagocytosis means “cell eating”; method used to take in “food” molecules used to take in “food” molecules
Phagocytosis: cytoplasm surrounds “food” Phagocytosis: cytoplasm surrounds “food” particle, forms a vacuole, then engulfs the particle, forms a vacuole, then engulfs the vacuolevacuole
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PhagocytosisPhagocytosis
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PhagocytosisPhagocytosis
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PinocytosisPinocytosis
Pinocytosis: method used to take in liquid Pinocytosis: method used to take in liquid
Pinocytosis: pockets form along the cell Pinocytosis: pockets form along the cell membrane, pockets fill with liquid, pockets membrane, pockets fill with liquid, pockets pinch off to form vacuoles within the cell pinch off to form vacuoles within the cell
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PinocytosisPinocytosis
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Phagocytosis vs. PinocytosisPhagocytosis vs. Pinocytosis
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Active Transport: ExocytosisActive Transport: Exocytosis
Exocytosis: membrane of a vacuole (or Exocytosis: membrane of a vacuole (or lysosome) fuses with the cell membrane lysosome) fuses with the cell membrane and expels waste material into the and expels waste material into the extracellular environment extracellular environment
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ExocytosisExocytosis