History of Cell Discovery

1
History of Cell Discovery

• Robert Hooke
• In 1663 Hooke observed cells in a sliver of cork.
• Was the first to use the term cell for living
  things.

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• Anton van Leeuwenhoek -
• Known as the father of microbiology
• Was known to have made over 500 microscopes
• Using his microscopes, he was the first to
  describe muscle fibers, bacteria, and blood
  flow in capillaries

3

• Matthias Schleiden -
• Was a botanist who concluded that all plants are
  made of cells
• Noted the role of the nucleus in cell division

4

• Theodor Schwann
• Was a professor of physiology
• Credited as being the first to conclude that all
  animals are composed of cells
• Schleiden and Schwann both published separate
  conclusions that all living things are made up of
  cells (beginning of The Cell Theory)

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• Rudolph Virchow
• Years later proposed an important extension of
  the cell theory that all living cells arise from
  preexisting cells

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The Cell Theory

• All organisms (living things) are made of one or
  more cells
• Cells are the smallest working unit of organisms
• All cells are produced from other cells

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Early Microscopes
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Modern Microscopes
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Figure 4.2 The Scale of Life
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Figure 4.2 The Scale of Life
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Levels of Organization of Living Things
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Cell (smallest working unit that is alive)
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Tissue(group of similar cells that work
together)
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Organ(group of tissues that work together)
15
Organ System(groups of organs that perform
related functions)
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Organism
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Population(organisms of same species that
interact in an area)
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Community(all the living things that interact in
an area)
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Ecosystem (Community the physical environment
they interact with)