In this video, Mahalo's biology expert, Mary Poffenroth, discusses the history of cell theory and what it currently states.
What it Says
Cell theory states that all living organisms are made of cells and that these cells originated from other cells. It also states that all cells contain hereditary information that is passed from cell to cell through cell division. Finally, the theory states that all energy flow occurs in the cell.http://www.youtube.com/watch?v=BI6Gbyxq8eY
History of Cell Theory
In 1838, two scientists, Theodor Schwann and Matthian Schleiden were discussing their research. It is believed that when Schleiden mentioned the nuclei he had observed in his plant cells, Schwann correlated this to the animal cells he had been studying. The next year, Schwann published "Microscopic Investigations on the Accordance in the Structure and Growth of Plants and Animals," which failed to give any credit to Schleiden. In his work, Schwann put forth two theories: cells are the units of structure, physiology and organization and that they function on an individual level and as part of a whole organism. Later in 1855, Rudolph Virchow added the fact that cells replicate through division and arise from pre-existing cells.http://www.youtube.com/watch?v=BI6Gbyxq8eY
References
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Introduction to Biology 0:00
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All About Cells 0:00
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Discovery of Cells 0:00
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Cell Theory 0:00
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Prokaryotic Cells vs. Eukaryotic Cells 0:00
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Eukaryotic Cells and Animal Cells vs. Plant C... 0:00
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Osmosis vs. Diffusion 0:00
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The Nucleus 0:00
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The Plasma Membrane 0:00
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Cytoskeleton 0:00
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Mitochondria 0:00
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Endoplasmic Reticulum 0:00
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Lysosomes 0:00
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Ribosomes 0:00
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The Golgi Apparatus 0:00
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Enzymes 0:00
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Chloroplasts 0:00
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Blood Cells of the Human Body 0:00
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Stem Cells 0:00
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Classification of Living Things 0:00
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The Taxonomic Hierarchy 0:00
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Classification and Domains 0:00
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How to Read Scientific Names 0:00
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Autotrophs vs. Heterotrophs 0:00
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Trophic Levels and Producer vs. Consumer 0:00
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Angiosperms and Pollinators 0:00
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Good Bacteria vs. Bad Bacteria 0:00
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Keystone Species vs. Indicator Species 0:00
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Genetically Modified Organisms 0:00
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Ecosystems and Communities 0:00
Meet Our Experts
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Mary Poffenroth
Mary Poffenroth is an adjunct professor of biology at San Jose State University. She holds a master's degree in biological sciences from same. Apart from hosting Mahalo videos, Poffenroth writes, produces and hosts her own short films. One such film received two honorable mentions at the 2010 International Wildlife Film Festival and her videos also appear in the 2011 edition of the Wiley International college textbook. "I want to make deceptively educational videos," she says, "that will both entertain and inspire."
Fast Facts
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Fact:
Cells were discovered and named by Robert Hooke in 1665 because they resembled the rooms a monk would live in.http://kentsimmons.uwinnipeg.ca/cm1504/celltheory.htm -
Fact:
Anton van Leeuwenhoek was the first person to see a live cell under a microscope in 1674.http://kentsimmons.uwinnipeg.ca/cm1504/celltheory.htm -
Fact:
There are two basic kinds of cells--prokaryotes (cells without nuclei) and eukaryotes (cells with nuclei).http://kentsimmons.uwinnipeg.ca/cm1504/celltheory.htm
