Transport In and Out of Cells

  • Created by: Addison13
  • Created on: 21-11-19 18:53
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  • Transport In and Out of Cells
    • Diffusion
      • Is the net movement of particles from an area of higher concentration to lower concentration
      • Spread out until they are evenly spread out
      • Happens because particles move randomly and spread out
      • Examples of diffusion in living organisms
        • Oxygen and carbon dioxide diffuse during gas exchange in lungs, fills and plant leaves
        • Digested food molecules from the small intestine diffuse into the blood
    • Factors affecting Diffusion
      • The concentration gradient
      • The temperature
      • The surface area of the membrane
        • A single-felled organism has large surface area to volume ratio
          • This allows enough molecules to diffuse into and out of the cell to meet the needs of the organisms
        • In multicellular organisms there is a smaller surface area to volume ratio
          • However surfaces and organ sysems are speculated for exchanging materials
    • Osmosis
      • Water may move across cell membranes by osmosis
      • Is the diffusion of water from a dilute solution to a concentrated solution through a semi permeable membrane
    • Active Transport
      • Moves substances against a concentrationgradient
        • From an area of low concentration to high concentration
        • Requires energy from respiration
      • Allows mineral ions to be absorbed into plant root hairs from dilute solutions in the soil
      • allows sugar molecules to be absorbed from lower concentration in the gut into the blood, which has a higher concentration


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