Cells and the Cell Theory

1
Cells and the Cell Theory

• Pages 27 - 31

2
What is a cell?

• The basic unit of every living organism.
• The basic unit of structure and function.
• Plants and Animals are many of many cells
  multi-cellular.
• Page 27

3
When were cells discovered?

• Cells were discovered in the 17th century (1600s)
  shortly after the invention of the microscope.

4
Who Discovered Cells?

• Hooke- looked at cork cells (from a cork tree
  dead cells)
• observed the first cells in 1663, gave the name
  cell. (honeycomb)
• Page 28 Figure 8.
• 1 cubic inch contain 1.2 million cells.
• Leewenhoek- looked at animalcules in 1675
• first man to observe living things.
• Page 29 Figure 9.
• One cell organisms.

5
What is the Cell Theory?

• Central idea of Life Science
• When more powerful microscope was invented in
  early 1800s knowledge of cells increased
• This theory explains the relationship between
  cells and every living thing
• It contains 3 ideas
• All living things are composed of 1 or more cells
  (single to many)
• Cells are the basic unit of structure and
  function of all living things (building blocks)
• All cells are produced from other living cells
  (Pasteur)

6
Who developed the Cell Theory?

• Matthias Schleiden- (German botanist-1838)
  found out that all plants are composed of cells.
  (pg. 29)
• Theodor Schwann- (German zoologist- 1839) found
  out that all animals are composed of cells. (pg.
  29)
• Rudolf Virchow- (German physician- 1855)
  discovered that cells come from other cells. (pg.
  29)
• After learning about each others work /
  collected information, Schleiden and Schwann
  published Cell Theory.