1. Chapter 3 Dr. Altstiel Naples High School
The Cell Theory
Chapter 3
Dr. Altstiel
Naples High School

2. Scientist’s and Their Discoveries that Aided in the Development of the Cell Theory

3. Robert Hooke
Hooke – first to coin the term “cells.” Looked at dead cork cells, which looked like little empty cubicles, or cells.

4. Anton van Leeuwenhoek
Leeuwenhoek – first to view living cells with a microscope (hand-held magnifying glass).

5. Matthias Schleiden
Matthias Schleiden – studied plants – concluded that all plants made up of cells.

6. Theodor Schwann
Theodor Schwann – concluded that all animals are made up of cells.

7. Rudolph Virchow
Rudolph Virchow – determined that cells can only come from other cells.

8. The Cell Theory All living things are made up of one or more cells.
Cells are the basic units of structure and function in organisms.
All cells arise from existing cells, or cells can only come from pre-existing cells.

9. Cell Size Small cells function more efficiently than large cells.
100 trillion cells in human body. 5 micrometers to 20 micrometers.
Mycoplasma (smallest cell) = .2 micrometers
Amoeba = 1000 micrometers
Bird – egg yoke (largest)

10. Advantage of Multicellularity
Things entering and leaving cell must cross the membrane; therefore a high surface area –to-volume ratio of many small cells is more efficient than a large cell that has a low surface area –to-volume ratio.

11. Homework
Calculating Surface Area and Volume (Math Lab) 1-3, Pg 56.