The Cell Theory
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From Hooke to Modern Cell Theory: Discovery & Development, Slides of Cell Biology
An overview of the history of cell theory, from Robert Hooke and Anton van Leuwenhoek's initial discoveries to the modern understanding of cells as the basic unit of life. The document also discusses the importance of cell theory in various fields such as medicine and health research.
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2021/2022
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The Cell Theory
Some Random Cell Facts
The average human being is composed
of around 100 Trillion individual cells!!!
It would take as many as 50 cells to
cover the area of a dot on the letter “i”
WOW!!!
Anton van Leuwenhoek
1673- Used a handmade microscope to observe pond scum & discovered single-celled organisms He called them “animalcules”
He also observed blood cells from fish, birds, frogs, dogs, and humans Therefore, it was known that cells are found in animals as well as plants
150 - 200 Year Gap???
Between the Hooke/Leuwenhoek discoveries
and the mid 19th^ century, very little cell
advancements were made.
This is probably due to the widely accepted,
traditional belief in Spontaneous Generation.
Examples:
-Mice from dirty clothes/corn husks
-Maggots from rotting meat
Development of Cell Theory
1838- German Botanist, Matthias Schleiden,
concluded that all plant parts are made of cells
1839- German physiologist, Theodor Schwann,
who was a close friend of Schleiden, stated that
all animal tissues are composed of cells.
Development of Cell Theory
1858- Rudolf Virchow, German physician,
after extensive study of cellular pathology,
concluded that cells must arise from
preexisting cells.
Modern Cell Theory
Modern Cell Theory contains 4 statements, in
addition to the original Cell Theory:
The cell contains hereditary information(DNA) which is passed on from cell to cell during cell division. All cells are basically the same in chemical composition and metabolic activities. All basic chemical & physiological functions are carried out inside the cells.(movement, digestion,etc) Cell activity depends on the activities of sub-cellular structures within the cell(organelles, nucleus, plasma membrane)
How Has The Cell Theory Been Used?
The basic discovered truths about cells, listed
in the Cell Theory, are the basis for things
such as:
Disease/Health/Medical Research and Cures(AIDS, Cancer, Vaccines, Cloning, Stem Cell Research, etc.)