The Cell Theory

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The Cell Theory
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Long ago people believed

• Mice came from
• old grain sacks.

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People thought

• Frogs came from
• mud.

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People thought

• Maggots came from rotting meat.

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WHY???

• Because that is what they observed.

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This is called

• Spontaneous Generation

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Spontaneous Generation is NOT TRUE!
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People created that theory because they had no
better idea of how these organisms really were
created.
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Now the real story

• Scientists started to test the old theories and
  found them to be incorrect.

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Read p. 151-152 in your book.

• Look for and write in your notes
• Van Leewenhoek
• Hooke
• Schleiden
• Schwann
• Virchow

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• What contributions did the previous people make
  towards the development of the cell theory?
• Van Leewenhoek-The first ______
• Hooke -Named first ______
• Schleiden -All ____ made of cells
• Schwann -All ____ made of cells
• Virchow -All ___ come from ___

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There are 3 parts to the Cell Theory
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1st Part

• All cells come from existing cells.

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2nd part

• Cells are the
• basic unit of life.

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3rd part

• All living organisms are made of cells.