1. The Cell Theory

2. WOW!!! 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!!!

3. Objective 30: I can describe Robert Hooke and Anton van Leeuwenhoek
Robert Hooke –1665 discovered cells by looking at a slice of cork under the microscope. He described the cells as tiny boxes or honeycomb. He thought they only existed in plants and fungus.
Anton van Leeuwenhoek: 1673 – observed pond scum under a hand held microscope and discovered single-celled organisms. He called them “animalcules”. He also observed the blood cells from fish, birds, frogs, dogs, and humans and found cells were found in animals AND plants.

4. 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

5. 19th Century Advancement
Much doubt existed around Spontaneous Generation
Conclusively disproved by Louis Pasteur
Pasteur: Ummm, I don’t think so!!! ? = +

6. Objective 31: I can describe Matthias Schleiden and Theodor Schwann
Matthias Schleiden, German Botanist, concluded that all plant parts are made of cells
Theodor Schwann German physiologist,, who was a close friend of Schleiden, stated that all animal tissues are composed of cells.

7. Objective 32: I can describe Rudolf Virchow
Rudolf Virchow,1858-, German physician, concluded that cells must come from other cells.

8. Obj 33: I can explain the 3 parts of the cell theory.
The 3 Basic Components of the Cell Theory were now complete:
1. All organisms are composed of one or more cells. (Schleiden & Schwann)( )
2. The cell is the basic unit of life in all living things. (Schleiden & Schwann)( )
3. All cells come from other cells. (Virchow)(1858)