1. DEVELOPMENT OF THE CELL THEORY
Contributers to the Cell Theory

2. Antonie van Leeuwenhoek
lived from 1632 to 1723
He made and improved single lens microscopes
He observed many kinds of living cells: Algae, Bacteria, Protozoa, and multi-celled organisms

3. Leeuwenhoek’s Microscope :

4. Drawings by Leeuwenhoek’s

5. Robert Hooke He Lived From 1635 to 1703
Made one of the best microscopes in the world for it’s time

6. Robert Hooke Looked at Cork
His drawing:
He saw little compartmentsand he called them “Cells”
He Gave Cells Their Name

7. Robert Brown lived from 1773 to 1858 He was a Botanist
First person to identify the Cell’s nucleus

8. These are Orchid leaves which he observed:
Nucleus

9. Matthais Schleiden He lived from 1804 to 1881
Professor of Botany instead
In 1838, he came up with the idea that all plants are made from cells

10. Theodor Schwann Nerve Cells Lived from 1810 until 1882
He Studied Muscle Cells, Nerve Cells and Yeast Cells
Concluded that Animals are also made up from cells
Nerve Cells

11. Rudolf Virchow
Lived from 1821 until He was a medical doctor. He concluded that all cells come from other cells
He pushed the idea that diseases usually result from problems with cells rather than from problems with other bigger parts of the body

12. 3. Cells are the basic unit of life
Together, Schleiden, Schwann and Virchow are given most of the credit for coming up with the CELL THEORY which states:
1. All living things are made from cells 2. All Cells are produced from other cells
3. Cells are the basic unit of life

13. 1930’s- Electron Microscopes
Electron microscopes which magnify things 100’s of thousands of times bigger allows us to identify many cell parts and jobs.

14. TEM- Transmission Electron Microscopes- focus electron beams through thinly sliced objects. Electrons that pass through are recorded on the other side of the slide.
Chloroplast at 10,000x

15. SEM- Scanning Electron Microscopes- scatters electrons over the surface of an object. Electrons reflect into screen. Gives a 3-dimensional look.
Red Cell, Platelet, White Cell at 2,000x

16. SEM- Fly(100x)

17. SEM- Steel (10,000)

18. Smaller parts in the cell
TEM-10,000x

19. Classification of Cell Types.
All cells have a cell membrane
(boundry for the cell) and cytoplasm (gelatin like material inside).

20. Classification of cell types.
Prokaryote = no nucleus or membrane bounds organelles
(Bacteria)(Archaea)
Eukaryote = have a nucleus and membrane bounds organelles
(Animal) (Plant) and others.
Prokaryotes have ribosomes

21. What are organelles?
Specialized part of a cell having some specific function; cell organ

22. Prokaryote

23. Prokaryote

24. Eukaryotes
Plant Cells
Animal Cells

25. Plant Cells Have a Cell wall around the Membrane that gives them a regular shape (Like Bricks In A Wall):

26. Animal Cells Have No Cell wall around the Membrane they often have irregular shapes:
Brain Cells
Blood Cells

27. Some Single Cell Organisms have many special parts that allow them to do with just one cell the same things that most other creatures do with millions of cells: