Download “cells”.

Introduction to Cells
EQ: What ideas make up the cell theory?
Robert Hooke
naturalist, philosopher, inventor, architect....
(July 18, 1635 - March 3, 1703)
In 1665 Robert Hooke
ROBERT
HOOKE:
publishes his
book,
looked
at cork
with a
Micrographia,
which
microscope
and saw
contains his drawings
of
sections
of cork as seen
little structures
he
through
one of the first
called “cells”
microscopes (shown at
right).
He was the first person to
use the term “cells”.
Anton van Leeuwenhoek
1632-1723
In 1673 Anton van
Leeuwenhook
LEEUWENHOEK:
perfects the simple
looked at
water with
microscope
and
microscope
and saw
observes
cells and
microorganisms.
tiny living organisms
He
discovered
(microorganisms)
bacteria in 1674 and
four years later, he
discovers protozoa.
a
Cell Theory
Matthias
Schleiden
Theodore Schwann
all plants are made all animals are made
of cells
of cells
Cell Theory
Rudolf Virchow
all cells came from
pre-existing cells
Cell Theory
Matthias
Schleiden
concluded that all
plants are made of
cells (1838)
Theodore
Schwann
concluded that all
animals are made
of cells (1839)
Rudolf Virchow
concluded that all
cells came from
pre-existing cells
(1855)
Cell Theory
• all living things are made up of cells
• cells are the basic units of structure and
function in an organism
• new cells are produced from existing cells
The Levels of Organization
Multicellular organisms are arranged from simple to
complex according to their level of cellular grouping.
cell
tissue
organ
organ
system
organism
Levels of Organization
What is the benefit of being made of all of
these cells?
Level
Function
Organ
system
Different organs
function together
Organ
Different tissues
function together
Tissues
Cells
Similar cells
function together
Cells can perform
special jobs
Example
Nervous System
Brain
Nervous Tissue
Neuron