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Discoveries of the Cell Theory © Copyright 2015 – All rights reserved. www.cpalms.org

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Discoveries of the Cell Theory

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RomansWhen 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

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DAY 1 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.

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CONTRIBUTORSThere are 5 contributors to the cell theory:

1. Robert Hooke2. Anton van Leeuwenhoek3. Matthias Schleiden4. Theodor Schwann5. Rudolf Virchow

Each of the above contributors produced evidence through investigations and

experiments that led to today’s cell theory!© Copyright 2015 – All rights reserved.

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HOME LEARNING

Review all notes taken in your interactive notebook in class today!

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DAY 2 BELL-RINGER !

1. The cell theory is composed of how many parts?

2. How many contributors help compile today’s cell theory?

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ROBERT HOOKEEnglish 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.

o Investigated 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 © Copyright 2015 – All rights reserved.

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MONASTERY

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HOOKE’S INVESTIGATION/EXPERIMENT

Hooke’s Observations Hooke’s Microscope

https://en.wikipedia.org/wiki/Robert_Hookehttps://en.wikipedia.org/wiki/Robert_Hooke © Copyright 2015 – All rights reserved. www.cpalms.org

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ANTON VAN LEEUWENHOEKDutch Tradesman

oStudy new approaches for creating lenses to observe cloth.

oLeeuwenhoek’s microscope was more powerful than Hooke’s compound microscope.

oFrom 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!

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LEEUWENHOEK’S INVESTIGATIONS/EXPERIMENT

Leeuwenhoek’s Observations

Leeuwenhoek’s Microscope

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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.

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THEODOR SCHWANNGerman 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!

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RUDOLF VIRCHOWoBased 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! © Copyright 2015 – All rights reserved.

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RECAPCell TheoryThere 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!

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DAY 2 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)

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