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Life Processes What are the characteristics of life?

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  • Life ProcessesWhat are the characteristics of life?

  • LIFE PROCESSESLooking at living things

  • What is a living thing?Imagine that you are space traveler who lands on an unknown planet. How could you determine if what you are looking at is alive. Ex. A rock and a blade of grass.


  • Key ConceptsMetabolism all the chemical activities an organism must carry on to sustain life.

    Homeostasis the maintenance of a stable internal environment in spite of changes in the external environment.

  • NutritionIncludes the activities involved in ingestion (obtaining food from the environment) and digestion (processing food for use by the organism). It also includes egestion (removal of solid wastes)

  • Nutrition - Ingestion

  • Nutrition - Digestion

  • Nutrition - Egestion

  • Nutrition Egestion in Leukocytesin which the bacteria, having been ingested and enclosed in a digestive vacuole by the leukocyte, are ejected by the living cellto the outside

  • Nutrition egestion in mammals

  • TRANSPORTThe absorption of materials through cell membranes and the circulation, or distribution of materials to all the cells of an organism.

  • TRANSPORTElodea cellsHuman Circulation

  • RESPIRATIONThe process of releasing energy from organic molecules for use by cells.

    During respiration glucose is broken down, and the energy released is stored in the compound ATP.

    Energy released by the compound ATP is used by organisms to perform life functions.

  • RESPIRATIONPlants and animals use the oxygen in the air to turn food into energy.


  • RESPIRATIONHuman Respiratory System

  • EXCRETIONThe elimination of cellular waste products from the organism.

    These wastes include water, carbon dioxide, salts, and nitrogen-containing compounds.

  • EXCRETIONUrine Sample

  • SYNTHESISChemical reactions in which small molecules combine to form larger ones.

  • SYNTHESISCombining 2 glucose molecules to make a larger maltose molecule

  • GROWTHAn increase in size brought about by increases in cell size and cell number.

    The raw materials for growth are the products of synthesis.


  • REGULATIONThe control and coordination of life functions.

  • REGULATIONNucleusBrain

  • All living things respond to changes. Living things notice changes in their surroundings and react to them.

    Eg. Plants grow towards the light.

    Eg. People react to the temperature around them.

  • REPRODUCTIONThe production of new individuals.

    Reproduction is necessary for the survival of a species, or kind of organism.



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