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Cell Theory and the Scientists behind It

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on 21 November 2013

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Transcript of Cell Theory and the Scientists behind It

Cell Theory and the Scientists behind It
Cell Theory
3 tenets:
1. All living things are made up of cells
2. Cells are the basic units of structure and function in living things
3. Living cells come only from other living cells
Cells are the basic units of structure and function in living things
Living cells come only from other living cells
Before: Spontaneous Generation
Salamanders from fires

Maggots from dead flesh

Fleas from dust

Etc.
After: Cell Division
1840's: Robert Remak - all cells come from division of living cells

Remak was Jewish, so he was denied professorship/credibility

1855: Rudolph Virchow - all cells come from division of living cells (look familiar?)
Before: Bichat's 21 Tissues
Marie-Francois-Xavier Bichat - around 1800

All organs come from 21 different types of tissues
After: Everything is Just Cells!
1824: Henri Dutrochet - "The cell is the fundamental element of organization"
Before: Living Things Made of Tissues
Before microscopes came around people could only guess as to what living things were made of. They DID know about organs and tissues though.
After: Living? You're Made of Cells!
1838: Matthais Schleiden - plants are made of cells

1839: Theodor Schwann - animals are made of cells
Discovering Cells
Robert Hooke wanted to look at EVERYTHING under a microscope in 1665
fabric, leaves, glass, flint, frozen urine, and
cork
Cork: saw empty spaces with walls around them - 1, 259, 712, 000 of them
The spaces looked like the cells monks lived in, so that's what he called them
Living Cells!
Anton van Leeuwenhoek was looking at some lake water under a microscope in 1676

Saw "animalcules," which turned out to be single-celled organisms

Later found bacteria by looking at his own saliva

All living things are made up of cells
Full transcript