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THE CELL THEORY

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									  THE CELL THEORY
 BROUGHT TO YOU BY...
•Jennsen
   •Hooke
      •Leeuwenhoek
         •Brown
            •Schleiden
              •Schwann
                 •Virchow
  THE CELL THEORY
ALL LIVING THINGS ARE MADE
         UP OF CELLS
CELLS ARE THE BASIC UNIT OF
  STRUCTURE & FUNCTION IN
        LIVING THINGS
   ALL CELLS COME FROM
      PREEXISTING CELLS
  Zaccharias Jennsen

                                                        Believed to be the
                                                         inventor of the
                                                         compound
                                                         microscope in 1595
                                                        Hans, Jenssen's
                                                         father, helped create
                                                         the lens of the
                                                         microscope
•http://micro.magnet.fsu.edu/primer/museum/images/janssen.jp
g
http://micro.magnet.fsu.edu/optics/timeline/people/janssen.html
ROBERT HOOKE
    1665
    FIRST TO USE THE
     TERM “CELL”
    SAW THE WALLS OF
     DEAD PLANT CELLS
     (CORK)
    REMINDED HIM OF THE
     ROOMS IN A
     MONASTERY (cells)
     LEEUWENHOEK
1670’s
FIRST TO USE THE
 MICROSCOPE FOR
 SCIENTIFIC PURPOSES
FIRST TO SEE LIVING
 MICROSCOPIC
 ORGANISMS WHICH HE
 CALLED “ANIMALCULES”
       Robert Brown
1831
Botanist
Described the
 nucleus of cells
 in great detail
SCHLEIDEN
   1839
   BOTANIST
   used improved
    microscope to
    determine that all
    plants are made up
    of cells and that
    cells “are alive!”
       SCHWANN

1839
ZOOLOGIST
worked with
 Schleiden
all animals are
 made up of cells
VIRCHOW
     1855
     PHYSICIAN
     ALL CELLS ARISE
      THROUGH THE
      DIVISION OF
      EXISTING CELLS
     In other words: cells
      make more cells.
 THE CELL THEORY
 DEVELOPED THROUGH THE
    OBSERVATIONS AND
 CONCLUSIONS OF THESE AND
  MANY OTHER SCIENTISTS!

THESE OBSERVATIONS COULD
NOT HAVE BEEN MADE WITHOUT
  THE DEVELOPMENT OF THE
        MICROSCOPE!
       Light Microscope
THEN                   NOW
        Use light to
        view object.

        Can magnify
           Up to
          1000x
Light Microscope Micrographs




Mouse Embryos
     50x        Cheek Cell
                  100x
   Electron Microscope
 TEM                     SEM




Use electrons to view object.
    Can magnify up to
        1,000,000x
SEM micrograph of head louse
  TEM micrographs




Zebrafish eyes   Mouse heart
                  42,903x
  THE CELL THEORY
ALL LIVING THINGS ARE MADE
         UP OF CELLS
CELLS ARE THE BASIC UNIT OF
  STRUCTURE & FUNCTION IN
        LIVING THINGS
   ALL CELLS COME FROM
      PREEXISTING CELLS

								
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