Transcript Chapter 1 Cell Structure and Functions

Chapter 1 Cell Structure
and Functions
Lesson 1 – Discovering Cells
Cells are the basic units of structure and
function in living things.
 An organism’s functions are the processes
that enable it to stay alive and reproduce.
 One centimeter of you skin’s surface
contains more than 100,000 cells.
 Until the 1600’s, no one knew cells
existed because there was no way to see
them


http://www.youtube.com/watch?v=6dMlde9akBk&feature=related
An overview of cells

The invention of the microscope made it
possible for people to discover and learn
about cells.
First Observations of Cells





One of the first people to observe cells was the
English scientist and inventor Robert Hooke.
Hooke built his own compound microscope,
which was one of the best microscopes of his
time.
Hooke observed a cork under a microscope and
found that the cork had tiny little holes that he
called cells, meaning “small rooms.”
Leeuwenhoek also observed tiny objects with
microscopes and found tiny one-celled organisms
when he looked at samples of waters.
He called these one-celled organisms
animalcules, meaning “little animals.”
Robert Hooke and Anton Van
Leeuwenhoek
The cell theory states.
1. all living things are composed of cells
2. cells are the basic units of structure
and function in living things
3. all cells are produced from other cells
This cell theory was developed by three
famous scientists: Schleiden, Schwann,
and Virchow.

Development of the Cell Theory
The lenses in light microscopes magnify
an object by bending the light that passes
through them.
 A magnifying lens is a complex lens.
 Electron microscopes use a beam of
electrons instead of light to produce a
magnified image.


http://www.youtube.com/watch?v=JnlULOjUhSQ&feature=related
Light and Electron Microscope