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THE CELL

THE CELL. I . Why Study Cells?. Body is made up of cells: RBC Nerve Cells Skin Cells Muscle Cells. B. Some more examples. White Blood Cells T Cells & B Cells Reproductive Cells Stem Cells. C. Certain Cells can make us sick. Bacterial Cells Cancer Cells Protists.

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THE CELL

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  1. THE CELL

  2. I. Why Study Cells? • Body is made up of cells: • RBC • Nerve Cells • Skin Cells • Muscle Cells

  3. B. Some more examples • White Blood Cells • T Cells & B Cells • Reproductive Cells • Stem Cells

  4. C. Certain Cells can make us sick • Bacterial Cells • Cancer Cells • Protists

  5. II. History of Cell Biology • Zacharias Janssen • 1595 – invented 1st optical compound microscope

  6. 2. Robert Hooke • 1665 – used a light microscope to look at non-living cork cells

  7. 3. Anton van Leeuwenhoek • Made microscopes with magnification 10x greater • Observed living cells

  8. IV. Cell Theory • 150 years later….(early 1800’s) • Three German scientists developed a theory about cells from their observations.

  9. CELL THEORY • 1.) All living organisms are composed of one or more cells • 2.) Cells are the basic units of structure and function in an organism. • 3.) Cells come only from the reproduction of existing cells.

  10. V. Microscopes

  11. A. COMPOUND MICROSCOPE

  12. B. STEREOMICROSCOPE • Gives 3D images ofspecimen

  13. C. SCANNING ELECTRON MICROSCOPE (SEM) • Uses electrons instead of light to project surface image of specimen

  14. D. TRANSMISSION ELECTRON MICROSCOPE (TEM) • Works like light microscope except uses electrons

  15. Electron Microscopes • Can magnify up to 200,000 x

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