Biology: Exchange Of Materials

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  • Created by: Dan
  • Created on: 21-03-13 21:48
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  • Exchange Of Materials
    • Active Transport
      • Cells use Active Transport to absorb substances
      • Requires Energy
    • The Sports Drinks Dilemma
      • When we exercise we sweat
      • Ions & Water are lost in Sweat
      • Sports drinks contain Sugars and Ions that we loose in sweat helping us hydrate in more ways than 1
    • Exchange in the gut
      • Food we eat is digested in the gut into small soluble molecules
        • In the intestine these solutes are absorbed into the blood
    • Exchange in Plants
      • Stomata
        • Stomata are tiny holes in the leaves
        • Gases diffuse in & out of leaves through Stomata
        • Stomata are controlled by Guard cells that open and close
        • Plants lose water vapour through Stomata
      • Efficiency
        • Leaves flat and very thin
          • Gases don't need to diffuse very far
        • Internal Air spaces
          • Gases don't need to diffuse very far
  • Osmosis
    • Osmosis Is  movement of Water
    • Exchange Of Materials
      • Active Transport
        • Cells use Active Transport to absorb substances
        • Requires Energy
      • The Sports Drinks Dilemma
        • When we exercise we sweat
        • Ions & Water are lost in Sweat
        • Sports drinks contain Sugars and Ions that we loose in sweat helping us hydrate in more ways than 1
      • Exchange in the gut
        • Food we eat is digested in the gut into small soluble molecules
          • In the intestine these solutes are absorbed into the blood
      • Exchange in Plants
        • Stomata
          • Stomata are tiny holes in the leaves
          • Gases diffuse in & out of leaves through Stomata
          • Stomata are controlled by Guard cells that open and close
          • Plants lose water vapour through Stomata
        • Efficiency
          • Leaves flat and very thin
            • Internal Air spaces
      • Water diffuses through a Semi Permiable Membrane
        • Osmosis
          • Osmosis Is  movement of Water
      • Ions and Glucose can be absorbed via Active Transport
        • Surface Area is increased in the lungs by Alveolar (Air Sacks)
        • The Lungs contain the Gaseous Exchange
          • The Lungs
            • Gaseous exchange is the exchange of gases
              • Carbon Dioxide is exhaled by the Lungs
              • Oxygen is absorbed in lungs
            • Oxygen diffuses into the many capillaries ready for respiration
            • Carbon Dioxide diffuses from blood back out to Lungs ready to be exhaled
          • Carbon Dioxide diffuses from blood back out to Lungs ready to be exhaled
          • The Villi are the exchange surface for food molecules
            • Villi
              • Villi are finger like projections
              • Villi increase the surface area of the small intestine greatly
          • Villi are finger like projections
          • Villi
            • Villi increase the surface area of the small intestine greatly
          • Villi have a rich blood supply maintaining a steep concentration gradient
            • Oxygen
              • Needed for Respiration
              • Waste product of Photosynthesis
            • Gases
              • Carbon Dioxide
                • Needed for Photosynthesis
                • Waste Product of respoiration
              • Oxygen
                • Needed for Respiration
                • Waste product of Photosynthesis
            • Carbon Dioxide
              • Needed for Photosynthesis
              • Waste Product of respoiration
            • Stomata can open or close depending on water levels

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