Levels of Organization

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Levels of Organization
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We begin our journey with the atom

• The atom is the smallest particle that maintains
  its properties
• Remember! The atom is made of protons, neutrons
  and electrons

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Next, the molecule

• Two or more atoms bonded together

Fat
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Followed by the organelle

• Remember organelle means little organ
• Several molecules bonded together form the
  organelles, which are found inside of your cells

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And then, the cell

• The basic unit of structure and function of
  living things

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We interrupt this story for a quick review

• The three parts of the cell theory are
• All living things are made up of one or more
  cells
• Cells are the basic units of structure and
  function in living things
• Cells come only from other living cells

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Now back to your regularly scheduled PowerPoint
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Which makes up the tissues

• A group of cells that look alike and work together

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Kinds of tissue

• Muscle tissue made of cells that can become
  shorter (contract) and move bones

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• Epithelial (covering) tissue made of epithelial
  cells that are tightly joined together, protect
  the body (our skin!)

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• Kleenex tissue used to blow your nose

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• Connective tissue these cells work together to
  hold parts of the body together.
• Examples include bone, ligaments, tendons and
  blood

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• Nerve tissue made up of nerve cells or neurons,
  and carries messages throughout the body
• Nerve tissue makes up most of your brain and
  spinal cord
• Nerves make muscles act, and controls breathing,
  digestion and heartbeat

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And tissues make up organs

• A group of two or more tissues that work together
  to do a special job
• Examples include the heart, brain, and stomach

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The organs make up organ systems

• Groups of organs working together to carry out
  life processes and keep an organism alive
• Organ systems include digestive, endocrine,
  excretory, circulatory, and nervous

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And our story comes to an end (for now) with the
organism which is made up of all of the organ
systems functioning together
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An organism