Transcript 0 Meet The Scientists and Cell Theory

All living things are
composed of cells.
Cells are the basic units of
structure and function in
living things.
New cells are produced from
existing cells.
M EET THE S CIENTISTS :
D EVELOPING THE C ELL T HEORY
W HAT

IS A CELL ?
The cell is the basic unit of structure
and function in living organisms,
including plants and animals.
A LL LIVING THINGS ARE
MADE OF CELLS
Plants
Animals
TOOL USED TO VIEW
CELLS

The microscope is used to
magnify extremely small objects.
T IMELINE - 1590

Hans and Zacharias Janssen (1590)

Dutch lens grinders

Father and son

Produced first compound microscope
(two lenses)
T IMELINE - 1665

Robert Hooke (1665)

English scientist

Looked at a thin slice of cork through a
compound microscope and observed tiny,
hollow room-like structures

He called them cells, but he only saw the
outer cell walls because the cork cells
were not alive.
T IMELINE - 1680

Anton van Leeuwenhook (1680)

Dutch amateur scientist

Looked at blood, rain water, and
scrapings from teeth through a
simple microscope.

He called the structures he saw
“animalcules”.
T IMELINE - 1838

Matthias Schleiden (1838)

German botanist

Viewed plant structures under a
microscope and discovered that they
were made of cells
T IMELINE - 1839

Theodor Schwann (1839)

German zoologist

Viewed animal tissue taken from
animal organs under a microscope
and discovered the tissue
was made of cells
T IMELINE - 1855

Rudolph Virchow (1855)

German physician

Stated that living cells come only from
other living cells (This is a part of cell
theory.)