Life functions or processes
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Life Functions or Processes. Life Functions or Processes. 1, Nutrition : the obtaining & processing of materials by an organism for its use (a) ingestion – food intake by an organism (b) digestion – breakdown of complex foods to simpler foods by an organism. Life Functions or Processes.

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Life Functions or Processes

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Life functions or processes

Life Functions or Processes


Life functions or processes1

Life Functions or Processes

  • 1, Nutrition: the obtaining & processing of materials by an organism for its use

    (a) ingestion – food intake by an organism

    (b) digestion – breakdown of complex foods to simpler foods by an organism


Life functions or processes2

Life Functions or Processes

  • 2. Transport : [Circulation] distribution of materials within an organism

  • 3. Respiration : process used by an organism to release energy from their food.

    {Ex. Oxygen + glucose yields carbon dioxide + water+ ENERGY]

    This energy is needed to maintain life.


Life functions or processes3

Life Functions or Processes

  • 4. Synthesis : combining simpler chemical substances to form more complex ones.

    [Ex. Starches from simple sugars]

  • 5. Excretion : the removal of cellular wastes products

  • 6. Regulation : (coordination) the control of various activities of an organism.


Life functions or processes4

Life Functions or Processes

  • 7. Growth: increase in living matter by increasing cell size or cell number

  • 8. Reproduction: ability of organisms to form more of its own kind

    *(not needed for an organism’s survival but necessary for the survival of the species)

  • 9. Immunity: the ability of an organism to resist disease causing organisms and to fight invaders.


Life functions or processes5

Life Functions or Processes

  • Metabolism: the sum total of all life processes needed to sustain life

  • Homeostasis : the maintenance of internal stable environment by an organism ( a steady state)

    ~ A disruption in any organism's system will result in a corresponding disruption of homeostasis


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