Notes 3-1

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Notes 3-1

• Discovering Cells

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Cells

• All living organisms made up of cells
• Cells are basic unit of structure and function in
  living things
• Cells are very small and are measured in
  micrometers (µm), one micrometer is one millionth
  of a meter! Remember one centimeter is only one
  hundredth of a meter!
• Look at your skin one square cm contains over
  100,000 cells!!

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Cells and structure

• Your cells are the reason you are put together
  the way you are.
• They are why you have a body, a head, 2 arms, 2
  legs, 10 fingers, 10 toes, etc
• What in/on your body is made up of cells? (raise
  your hands)

Your skin, muscles, bones, blood, organs, etc.
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Cells and function

• Your cells are involved in all of the functions
  your body must perform
• Examples
• White blood cells fight of infections
• Skins cells provide your body with protection
• Red blood cells help provide oxygen to your vital
  organs

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Discovery of cells

• 1600s when microscopes came out
• Robert Hooke built a microscope and observed cork
  cells. Credited with naming them cells, meaning
  small rooms.
• Anton van Leeuwenhoek built a microscope and
  observed water samples. Found tiny moving
  organisms which he called animalcules, meaning
  little animals.

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Cell Theory States

• All living things are composed of cells.
• Cells are the basic units of structure and
  function in living things.
• All cells are produced from other cells.

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Unicellular and Multicellular

• Unicellular, or single-celled, organisms include
  bacteria, the most numerous organisms on Earth.
  Multicellular organisms are composed of many
  cells.

Unicellular
Multicellular
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Multicellular organisms

• Cells make up tissues, tissues make up organs,
  organs make up organ systems, organ systems make
  up organisms
• Example
• A collection of nerve cells makes up nervous
  tissue, nervous tissue makes up most of the brain
  (organ), brain controls the nervous system (organ
  system) which is one of the major systems that
  make up you (the organism)

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Cellular organization picture
Dont Draw. Just look and listen to teacher
description