Download he Cell Theory

CELL THEORY
 Observed
cork under a
microscope
 Called the
tiny boxes
“cells”
Robert Hooke (1635-1702)
 Made stronger
and clearer
lenses
 Observed onecelled
organisms
 Identified
bacteria, blood
cells and plant
anatomy
Antony van Leeuwenhoek
(1632-1723)
 Studied
plants
 Discovered
Robert Brown
(1773-1858)
an oval
structure
inside the
plant cells
(The Nucleus!)
Theodor
Schwann
(1810-1882)
Matthias
Schleiden
(1804-1881)
1. The cell is the unit of organization in living things.
2. The cell can exist alone or as a building block in the
construction of organisms
3. Cells form by free-cell formation (spontaneous
generation)
"Omnis cellula e cellula"
"All cells only arise
from pre-existing
cells"
Rudolf
Virchow
(1821-1902)
Louis Pasteur
(1822-1895)
Francesco Redi
(1626-1697)
 Living things cannot be
made from non-living things
Redi’s Experiment
CELL THEORY:
1. All living things are made of cells.
 Humans are made
of trillions of cells
CELL THEORY:
2. Cells are the basic unit of structure
and function in living things.
They do the life processes.
CELL THEORY:
3. All living cells come from other living cells.
CELL THEORY
1. All living things are made of cells.
2. Cells are the basic unit of structure
and function in living things. They do
the life processes.
3. All living cells come from other living
cells.
 Spontaneous generation – the belief that living
things arise from non-living things. This was proven
wrong by Redi and Pasteur. Virchow added the third
part of the cell theory.
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