9.1 Discovery of Cells

smallest functional and structural unit of all living organisms

Cell

any living thing

Organism

first to describe cells 1663

Robert Hooke

discovered animacules

Anton van Leeuwenhoek

Cell Theory #1

All living things are made of cells

Cell Theory #2

the cell is the basic unit of all organisms

Cell Theory #3

All cells come from pre-existing cells

Matthias Schleiden

discovered plant cells

Theodore Schwann

determined animal tissues are made of cells

Rudolf Virchow

determined that cells only form when other cells divide

micrometer

unit of measurement for cells

magnification

increase of an object's apparent size by using lenses or mirrors

resolution

the degree two separate structures that are close together can be recongnized

compound microscope

a light microscope that uses more than one lens to magnify an object

electron microscope

a microscope that focuses a beam of electrons to magnify objects