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The History of Cell Biology

The History of Cell Biology. The Discovery of Cells. All living things are made up of one or more cells A cell is the smallest unit that can carry on all the processes of life We did not always know about cells. The Discovery of Cells. Before cells, people believed in “humours”

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The History of Cell Biology

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  1. The History of Cell Biology

  2. The Discovery of Cells • All living things are made up of one or more cells • A cell is the smallest unit that can carry on all the processes of life • We did not always know about cells

  3. The Discovery of Cells • Before cells, people believed in “humours” • This was the idea that living things were made of elements • Those were phlegm, blood, bile or black bile • People had no way to see on a cellular level

  4. Hooke • In 1665, English scientist Robert Hooke looked at various items of nature • He looked through his light microscope on the bark of a cork oak tree • What he saw changed science

  5. Hooke • He saw a grouping of boxes that reminded him of cubical or cells where monks live • The little boxes were dead plant cells • He then went on to observe other specimens and determined that many things were made of cells

  6. Leeuwenhoek • The first person to observe living cells was a Dutch trader named Anton van Leeuwenhoek • In 1673 Leeuwenhoek observed protists

  7. Leeuwenhoek • Protists are very small microorganisms • This was the first time that living organisms were seen • It was also the first time that people started to realize that the world around them was made up of living organisms

  8. The Cell Theory • Even though there were Cells were recorded and observed by Hooke and Leeuwenhoek, scientists did not start to put the pieces together until much later • Around 150 years later scientists started to believe that all things were made of cells

  9. The Cell Theory • In 1838 German botanist Matthias Scheiden concluded that all plants were made of cells • In 1839 German zoologist Theodor Schwann concluded the same thing for animals

  10. The Cell Theory • These discoveries led Rudolf Virchow to observe that all cells come from existing cells • These discoveries helped shape “The Cell Theory”

  11. The Cell Theory • The Cell Theory • All living thing are composed of one or more cells • Cells are the basic units of structure and function in an organism • Cells come from existing cells

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