Life Processes

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Life Processes

• What are the characteristics of life?

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LIFE PROCESSES
Looking at living things
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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.

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What are the life processes?

• NUTRITION
• TRANSPORT
• RESPIRATION
• EXCRETION
• SYNTHESIS
• GROWTH
• REGULATION
• REPRODUCTION

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Key Concepts

• Metabolism 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.

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Nutrition

• Includes 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)

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Nutrition - Ingestion
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Nutrition - Digestion
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Nutrition - Egestion
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Nutrition Egestion in Leukocytes

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

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Nutrition egestion in mammals
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TRANSPORT

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

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TRANSPORT

• Elodea cells

• Human Circulation

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RESPIRATION

• The 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.

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RESPIRATION

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

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RESPIRATION
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RESPIRATION

• Human Respiratory System

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EXCRETION

• The elimination of cellular waste products from
  the organism.
• These wastes include water, carbon dioxide,
  salts, and nitrogen-containing compounds.

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EXCRETION

• Urine Sample

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SYNTHESIS

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

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SYNTHESIS

• Combining 2 glucose molecules to make a larger
  maltose molecule

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GROWTH

• An increase in size brought about by increases in
  cell size and cell number.
• The raw materials for growth are the products of
  synthesis.

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GROWTH
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REGULATION

• The control and coordination of life functions.

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REGULATION

• Nucleus

• Brain

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• 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.

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REPRODUCTION

• The production of new individuals.
• Reproduction is necessary for the survival of a
  species, or kind of organism.

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REPRODUCTION
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• LIFE PROCESSES VIDEO