Absorption & Secretion

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  • Created by: emily3
  • Created on: 19-03-14 19:30
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  • Absorption & Secretion
    • Absoption
      • Uptake of materials
      • diffusion
        • Secretion
          • Discharge of useful intercellular molecules
      • osmosis
        • Secretion
          • Discharge of useful intercellular molecules
      • active transport
      • Cell Wall
        • Cellulose
        • chains of glucose molecules grouped as fibres
          • strong & rigid
      • Plasma Membrane
        • protein
        • phospholipid
        • Phospholipid bilayer
          • hydrophilic head
            • waterloving
            • two outer surfaces
            • forms hydrogen bond with water molecules
            • outside layer in contact with extracellular fluid
            • inside layer in contact with intracellular fluid
          • hydrophobic tail
            • water hating
            • water insoluble
        • fluid arrangment
          • provides stable and effective boundary
        • allows small molecules through rapidly
          • water
        • larger molecules depend on proteins for entry/exit of the cell
          • Glucose
        • Proteins
          • vary in size and structure
          • provides structural support
          • contain channels for small molecules
          • act as carriers
            • actively pump molecules across membrane
          • serve as enzymes
            • catalysing biochemical reactions in/on membrane
        • selectively permable
      • Active Transport
        • movement of molecules across the plasma membrane
          • against a conc. gradient
        • opposite of passive transport
        • always requires energy
          • energy gained from respiration
        • certain conditions required
          • temperature
          • availability of oxygen
          • conc. of respiratory substance
            • glucose
    • slightly elastic
      • chains of glucose molecules grouped as fibres
        • strong & rigid
    • Hydrophilic
      • water loving
      • spaces normally water filled
      • Cellulose
    • receptors for hormones
      • Proteins
        • vary in size and structure
        • provides structural support
        • contain channels for small molecules
        • act as carriers
          • actively pump molecules across membrane
        • serve as enzymes
          • catalysing biochemical reactions in/on membrane
    • antigenic markers
      • identify blood/tissue type
    • freely Permeable
      • diffusion
        • opposite of passive transport
      • osmosis

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