1. Cell Theory Notes

2. Why are cells important?

3. Cells Obtain oxygen Obtain food and water Get rid of waste

4. Discovery of Cells • Cells were discovered when the microscope was improved. • In 1665, Robert Hooke cut a thin slice of cork and looked at it under his microscope. • Hooke thought the cork seemed to be made up of empty boxes, which he named cells.

5. Development of Cell Theory • Anton Van Leeuwenhoek • 1st person to see microorganisms • called them “wee beasties” and “animalcules” • Created a simplemicroscope in 1674 • Able to magnify up to 300X

6. Development of Cell Theory • In 1830s, Matthias Schleidenused a microscope to study plants and concluded that all plants are made of cells

7. Development of Cell Theory • Theodor Schwann, after observing different animal cells, concluded that all animals are made up of cells.

8. Development of Cell Theory • Several years later, Rudolf Virchow hypothesized that cells divide to form new cells. • Virchow proposed that every cell came from a cell that already existed. • These men’s ideas combined makes up the cell theory.

9. Development of Cell Theory • Eventually, they combined their ideas and became convinced that all living things are made of cells.

10. The Cell Theory composed of 3 statements: • All living things are composed of cells • The cell is the basic unit of structure and function. • All cells are produced from other cells