SC 3.1

• • In simple organisms, the required substances of cells such as oxygen and nutrients go directly into the cells by diffusion through cell membranes.
  • Complex organisms such as humans, vertebrates and multicellular plants have specialised transport systems.
• Simple organism (Unicellular Organisms)

  • Simple oraganism consisting of only one cell each
  • Each cell is a complete unit of life; able to carry out all the living processes in order to survive
  • Examples: Amoeba sp. and Paramecium sp. called protozoa
• Multicellular organism

  • Has more than one cell.
  • Multicellular organism more complex than unicellular organism
  • Example: hydra, spirogyra, fern, other plants, human being and all vertebrates and invertebrates animal
  • These larger organism need many different types of cell to carry out their life processes
  • This is achieved through cell specialisation and cell organisation
• Importance of the transport system

  • Transport system carries substances needed by cells such as oxygen and nutrients that are used to produce energy through cellular respiration. The energy is used for living processes in organisms
  • Transport system carries substances needed by plant cells such as mineral salts, water and products of photosysthesis (glucose) to carry out all living processes in plants
• Importance of the transport system

  • Transport system eliminates toxic waste products from the cells in organisms to the external environment. Toxic waste products that fail to be eliminated from the cells will poison and kill the organism concerned