A Tour of the Cell

Video links: An Overview of the Cell Structure

Amoeba Sisters: Introduction to the Cell

Here is the link to the video clip shown in 3rd period.

Inside a Human Cell

Today's class we continued with the functions of the organelles.  

The Animal Cell

 

 

 "Seeing is believing." The invention of the microscope made it possible to see cells and millions of tiny living organisms that are everywhere.

In 1665 Robert Hook used an early microscope to look at a thin slice of cork, the dead cells of oak bark. What he saw looked like rooms, which he called cells.  The microscope was developed from eyeglass markers ideas in the late 1500 who realized that using several glass lenses magnified things.

The Light Microscope allows light to pass through a specimen and uses two lenses to form an image.  Light waves are scattered as they pass through material.  Therefore light microscopes can magnify up to about 1000 times.

Electron Microscopes use beams of electrons focused my magnetic fields. These offer higher resolutions than light microscope.  These are used to only examine non-living cells and tissues.  The samples are chemically preserved so that they can be examined in a vacuum. The electrons are placed in a vacuum to prevent them from being scattered. 

 

Click on the link below to see how electron microscopes work:

How Electron Microscopes Work