Robert Hooke English scientist and inventor In 1665

Robert Hooke (English scientist and inventor) In 1665, he was one of the first people to observe cells. He named the cell.

In 1663 he observed a thin slice of cork using a compound microscope he built himself. The cork looked like the tiny rectangular rooms where monks lived in a monastery.

So… he called them cells. (Scientists aren’t known for being very creative. )

The "father" of the microscope was Anton van Leeuwenhoek (LAY vuhn hook)

This Dutch merchant did not invent the microscope, but he is credited with helping to perfect the simple microscope using his lens grinding skills.

After observing pond scum…

…he named the organisms he observed “animalcules” …which means “little animals. ” I told you…scientists aren’t very creative!

We call these unicellular organisms protists.

Schleiden and Schwann' s Cell Theory The original cell theory stated: 1. All living things were made of cells. 2. The cell is the basic unit of living things

Who Did What? Schleiden – German Botanist -Plant Cell Theory – 1838 He based his theory on his own research and that of others. M. J. Schleiden

Schwann --German Zoologist -- Animal Cell Theory – 1839 He based his theory on discoveries he made during his zoological research. Theodor Schwann

How can you remember which fellow did what? ? ? Schwann sounds like “swan” and a swan is an animal, so…Schwann developed the Animal cell theory. …Schleiden is the other guy.

In 1855, Rudolf Virchow (fur koh), a German cellular pathologist (a doctor who studies diseases of cells), proposed that new cells are formed only from existing cells.

Virchow added the third part of the Cell Theory in his work. This 3 -part theory is what is still used today.

The Cell Theory 1. All living things are made of cells. 2. The cell is the basic unit of all living things. 3. All cells come from cells.