Download Unit 2: The Cell - Mrs. Hale`s Science

Unit 2: The Cell
Microscope Section 1
Over View of the Cell
1. Basic units of structure and function of living things
2. Cells and Structure:
*structure of living organisms are determined by
the variety of ways cells are put together
Red Blood Cells
Nerve Cells
Skin Cells
3. Cells and Function:
• function of an organisms includes obtaining
oxygen, getting rid of waste, obtaining food and
growing
4. Size of a cell:
• cells are measured in units of micrometers
(µm) which is one millionth of a meter.
Scientist involved with Microscopes
and the Cell
• Van Leewenhoek
(late 1700s, early 1800s)
• Lenses & Microscopes
• Hooke (1665)
• Schleiden (1838)
• Observed Cellular nature
of cork slices
• Plant cells
• Schwann (1839)
• Animal cells
• Virchow (1858)
• All cells from preexisting
cells
The Cell Theory
• Developed by Schleiden, Schwann and
Virchow
• States:
– All living things are composed of cells
– Cells are the basic unit of structure and
function in living things
–All cells are produced from preexisting cells
Early Scientists
Robert Hooke
Early Microscope
Cork Cells
Microsopes
• One or more lenses that makes an enlarged
image of an object.
Types of Microscopes
1. Simple Microscope:
• Similar to a magnifying
glass and has only one
lens.
2. Compound Microscope
• Lets light pass through an
object and then through
two or more lenses.
3. Binocular (Stereoscopic)
Microscopes
• Gives a three dimensional
view of an object.
(Examples: insects and
leaves)
4. The Electron Microscope
• Uses a tiny beam
of particles called
electrons to
produce magnified
images
Electron Micrographs
Parts of the Microscope
Parts of the Microscope Answers