1. Discovering Cells
Chapter 1.2

2. Cells:living things::Bricks:houses
Analogy:
Cells:living things::Bricks:houses

3. Discovery of Cells
1590- The microscope was invented. This led to the discovery of cells
A microscope is an instrument that makes small objects look larger
Simple microscope- 1 lens
Ex. Hand lens
Compound microscope- light microscope

4. Key Terms When Using a Microscope
Magnification- enlarging something in appearance
Convex lens- the lens used in microscopes to magnify images. A convex lens "bends" light by bringing it in one side at one angle and sending it out the other at a different angle.
Resolution- the ability of a microscope to clearly distinguish the individual parts of an object. (the sharpness of an image) Example: Newspaper photo

5. Robert Hooke Robert Hooke is a scientist
In 1663 he used a self-built compound microscope to look at a cork.
Hooke thought the cork looked to be made up of numerous tiny rectangular rooms. He called these rooms cells (jail cell)
He estimated 1 cubic inch of cork had 1.8 billion cells.

6. Anton Van Leeuwenhoek Scientist
In 1660’s he built simple microscopes and looked at pond water. He observed one-celled organism that he called animalcules (an uh mal kyoolz) meaning ‘little animals.’
He also looked at scraping from teeth. He was the first to see what we now call bacteria

7. Matthias Schleiden & Theodor Schwann
1838- Schleiden concluded all plants are made up of cells.
1839- Schwann concluded all animals are made up of cells.
They still did not understand cells or where they came from

8. Rudolf Virchow
In 1855, Virchow proposed that all cells come from cells.

9. Cell Theory
The cell theory was created based on obervations by Hook, Leeuwenhoek, Schleiden, Schwann, Virchow and others.
Cell theory
All living things are composed of cells
Cells are the basic unit of structure and function in living things
All cells are produced from other cells

10. Big Idea Questions What led to the discovery of cells?
State cell theory.

11. Vocabulary Microscope Compound microscope Cell theory Magnification
Convex lens
resolution