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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 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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