Discovering Cells
Outline Notes
I. An Overview of Cells
O Cells are the basic units of
structure and function in living
things.
A. Cells and Structure
1. Structures of living things
are determined by the ways
in which cells are put
together
B. Cells and Function
1. cells allow an organism to
function
C. Many and Small
1. cells are very small and
cannot be seen with the
naked eye
II. First Observation of Cells
O The invention of the microscope
made it possible for people to
discover and learn about cells.
O Microscope-instrument that
makes small objects look larger
A. Robert Hooke
1.
1st person to see cells
2.
Built his own compound
microscope
3.
Looked at cork
4.
Saw many small spaces that
looked like rooms—called them
cells
B. Anton van Leeuwenhoek
1.
Built simple microscopes
2.
Looked at drops of lake water
3.
Saw one-celled organisms
4.
Called the organisms
animalcules “little animals”
III. Development of the Cell
Theory
A. Schleiden, Schwann, and
Virchow
1. Matthias Schleiden
a. Concluded that all plants are
made of cells
2. Theodore Schwann
a. Concluded that all animals are
made of cells
b. Stated that all living things are
made up of cells
3. Rudolf Virchow
a. Proposed that new cells are
formed only from cells that
already exist
B. What the Cell Theory Says
1.
Cell theory-widely accepted
explanation of the relationship
between cells and living things
2. Cell Theory States
a. All living things are composed
of cells.
b. Cells are the basic units of
structure and function in living
things.
c. All cells are produced from
other cells.