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00:00.0
But today, everything's gonna be A-OK!
00:05.8
The modern-day cell theory was formulated only after about 200 years
00:12.0
since the introduction of microscopy.
00:15.2
In 1665, English scientist Robert Hooke observed a piece of quark under a simple microscope.
00:24.7
He observed little boxes which he called cells
00:28.8
because he thought these structures resembled tiny rooms or cells occupied by moths.
00:36.4
He also reported that in living plants, these cells are filled with juices.
00:42.2
In 1673, Anton van Leeuwenhoek observed microscopic organisms from pond water
00:49.5
which he called animalcules.
00:53.9
Later, these organisms were found to be bacteria and protozoans.
01:00.6
He also reported his observations of blood cells and sperm cells.
01:05.4
In 1805, German naturalist Lorenz Ocken postulated that all organisms originated from
01:13.5
and consist of cells.
01:15.8
This became the initial statement of the modern cell theory.
01:21.2
In 1833, Robert Brown discovered the nucleus in plant cells
01:26.9
which were later also observed in animal cells.
01:30.6
As the microscope became more powerful, scientists Matthias Leiden and Rudolf Virchow
01:37.9
were able to see structures inside the cells.
01:41.4
They also observed that cells would grow larger and divide into smaller but still living cells.
01:49.2
Furthermore, they noted that some organisms are unicellular
01:56.3
while others are multicellular.
01:59.9
Rudolf Virchow also concluded that the cell is the basic structural unit of life
02:06.7
and that every cell is formed from pre-existing cells.
02:13.7
Based on these observations, the modern day cell theory evolved.
02:19.4
The three principles of the modern cell theory state that
02:24.1
first, every living organism is made up of one or more cells.
02:30.7
Some organisms like the bacteria and some protozoans are unicellular
02:35.6
while some organisms like plants and animals are made up of many cells.
02:41.0
Second, cells are the basic unit of organization of all organisms.
02:48.9
Third, cells arise only by division of a previous cell.
03:11.0
Thank you for watching!
