Download Cells 1.1 Discovering Cells: Cell Theory

Cells 1.1 Discovering Cells:
Cell Theory
What are Cells?
Cells are the basic units of structure and
function in living things.
http://www.youtube.com/watch?v=u54bRpbSOgs
What is the Cell Theory?
The Cell Theory is a widely accepted explanation
of the relationship between cells and living things.
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It states:
All living things are composed of cells.
Cells are the basic units of structure & function in living things.
All cells are produced from other cells.
http://www.youtube.com/watch?v=4OpBylwH9DU
Seeing Cells
Robert Hooke discovered cells in 1663. He was
looking at cork.
 Anton van Leeuwenhoek was the first to see
living cells.
 Schleiden, Schwann, & Virchow contributed to
the cell theory.
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◦ Schleiden concluded all plants are made of cells.
◦ Schwann concluded all animals are made of cells.
◦ Virchow proposed that new cells form
only from existing cells.