1- POSTULATES OF CELL THfgshfsjgORY.pptx

The Cell
© Copyright 2015 – All rights reserved. www.cpalms.org

SOME RANDOM CELL FACTS
•The average human being is
composed of around 100 Trillion
individual cells!!!
•It would take as many as 50 cells to
cover the area of a dot on the letter
“i”

OBJECTIVES;
•explain the postulate of cell theory
•construct a 3d model of a
plant/animal/ bacterial cell using
recyclable materials
•recognize the contributions made by
Anton Van Leeuwenhoek, Hooke, et
al in the cell theory

Romans
When Romans
discovered they were
able to make glass in the
1st
century BC, things
changed for the better!
Anton Van
Leeuwenhoek
He figured how to grind
glass together and
decided to experiment.
Leeuwenhoek made his
own 270x magnification
compound microscope!
Today, microscopes
magnifications range
from 200x-10,000,000x
magnification.
What is a
Theory?
A set of principles
developed over time via
multiple investigations.
The discovery of the
CELL was made through
the invention of the
microscope between
1665-1838.
How it all started 

CELL THEORY
There are 3 major parts of the cell theory:
1. All organisms are made of cells.
2. All existing cells are produced by other living
cells.
3. The cell is the most basic unit of life.

CONTRIBUTORS
There are 5 contributors to the cell theory:
1. Robert Hooke
2. Anton van Leeuwenhoek
3. Matthias Schleiden
4. Theodor Schwann
5. Rudolf Virchow
Each of the above contributors produced evidence
through investigations and experiments that led to
today’s cell theory!

BELL-RINGER !
1. The cell theory is composed of how many
parts?
2. How many contributors help compile today’s
cell theory?

ROBERT HOOKE
English Scientist
oUsed the compound microscope to observe
cork.
oHooke observed that cork is composed of
small, hollow compartments.
oThe parts prompted Hooke to think of small
rooms (cells) in a monastery, so he gave
them the same name: CELLS.
oInvestigated cork through experimenting with
the compound microscope and came up
with the name cells!
Key Note: Hooke discovered the cell in 1665,
which started formulating the cell theory!
https://en.wikipedia.org/
wiki/Robert_Hooke

CORK
https://commons.wikimedia.org/wiki
/File:Cork_oak_trunk_section.jpg

MONASTERY

HOOKE’S
INVESTIGATION/EXPERIMENT
Hooke’s Observations Hooke’s Microscope
https://en.wikipedia.org/wiki/Robert_Hooke
https://en.wikipedia.org/wiki/Robert_Hooke © Copyright 2015 – All rights reserved. www.cpalms.org

ANTON VAN LEEUWENHOEK
Dutch Tradesman
o Study new approaches for creating lenses
to observe cloth.
o Leeuwenhoek’s microscope was more
powerful than Hooke’s compound
microscope.
o From investigating and experimenting with
his microscope, Leeuwenhoek became
one of the first scientists to refer to living
cells when he observed an abundant
number of single-celled organisms, which
he called animalcules (plant & animal),
swimming in a drop of pond water!

LEEUWENHOEK’S
INVESTIGATIONS/EXPERIMENT
Leeuwenhoek’s Observations Leeuwenhoek’s Microscope

MATTHIAS SCHLEIDEN
German Scientist
oFascinated with plant cells, Schleiden
used the compound microscope and
studied plant cells.
oFrom investigating and experimenting
with plants, projected plant parts are
made of cells!
oDiscussed what he observed with his
dear friend, German scientist Theodor
Schwann.

THEODOR SCHWANN
German Scientist
oStudied plant & animal cells, and was
intrigued by the similarities between the
two.
oFrom investigating and experimenting
with plant & animal cells, Schwann was
able to determine that all animals are
made of cells!
oSchwann published the 1st
statement of
the cell theory: all living things are made
of cells and cell products!

RUDOLF VIRCHOW
oBased on his investigations and
experiments, he stated that all
cells come from preexisting cells,
which is the 2nd
part of the cell
theory: all existing cells are
produced by other living cells!
Key Note: After Virchow’s completed his
work, the cell theory was finally formulated
in 1838!

LET’S DO THE RECAP
Cell Theory
There are 3 major parts of the
cell theory:
1. All organisms are made of
cells.
2. All existing cells are
produced by other living
cells.
3. The cell is the most basic
unit of life.
These three parts were
discovered between 1665-
1838.
Contributors
There are 5 contributors to
the cell theory:
1. Robert Hooke
2. Anton van
Leeuwenhoek
3. Matthias Schleiden
4. Theodor Schwann
5. Rudolf Virchow
Eye-
Catchers
Robert Hooke
o came up with the name cells
Anton Van Leeuwenhoek
o referred to living cells called
animalcules (plant & animal) after
observing a drop of pond water
Matthias Schleiden
o projected plant cells are made of
cells
Theodor Schwann
o determined all animals are made of
cells (1st
statement of the cell theory)
Rudolf Virchow
o stated all cells come from preexisting
cells (2nd
statement of the cell theory)
Key Note: It took over 173 years for the
cell THEORY to be formulated, wow!

SOME PARTING THOUGHTS
•It is amazing to think that the cells that
make up our bodies are just as alive
as we are. Humans are just an
intricately designed community of
cells, which must work together to
survive.

EXIT TICKET
1. Name the 3 major parts of the cell theory.
2. Name the 5 contributors of the cell theory.
The wacky history of cell theory - Lauren Royal-Woods (TED-Ed)

HOME BASED ACTIVITY
Name the Cell Structures
of plants and animals
Give the functions of each

1- POSTULATES OF CELL THfgshfsjgORY.pptx

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