Introduction To Cells
The Creation of the Cell Theory
Some Questions….
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Which has bigger cells? An elephant
of a frog?
Which has more cells? And elephant
or a frog?
How many cells do humans have?
What is the smallest cell in your body?
What are the largest cells in your
body?
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Elephant and frog cells are the same
size…elephants just have lots more.
Humans have trillions of cells
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Many different kinds because of:
Many different jobs
Red blood cells are the smallest
Nerve cells are the longest.
3 Rules in Science
pg.2
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Structure tells Function
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Different structures do the same job
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Same structures can have different jobs
History of Cells
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First Studied in the 1600’s
Robert Hooke
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1665
English Scientist/Monk
Earliest Microscopes
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Studied Cork
Called spaces, “Cells”
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Monastery
pg 3
Anton Van Leeuwenhoek
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1675
Dutch Scientist
Pond Water
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Saw earliest Cell Types
LIVING!!!
pg. 4
Self-Quiz
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5.
6.
Which year were cells discovered?
Why did Hooke call them “cells?”
What 2 things did the “Hookes” look
at under the microscope?
What did the “Hooke’s” findings help
create?
Why is it better for humans to be
made of more than one cell?
More than one cell type?
Cell Theory
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pg. 5
Due to the “Hookes”
100 Years Later
3 Parts
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All living things are made of cells
Cells are the basic unit of life
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Smallest thing that can be alive
Builds bigger things
Cells can only come from other cells
3 Main Cell Parts
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Cell Wall/membrane
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Cytoplasm
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Plastic bag
Things go in and out
Jello
Keeps things in place
Organelles
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Fruit
Like Organs
All have a job to keep the
cell working right
2 Kinds of Cells
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Prokaryotic
“pro” means 1st or
before
 “karyotic” means
“nucleus”
1st cells
 Only bacteria today
No nucleus
Insides are “soup”
pg. 10
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Eukaryotic
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“Eu” = complex
Nucleus
Has Organelles
 compartments