Transcript Cell Notes - My Teacher Pages

Why Study Cell
Biology?
“…For every living
organism is, or at some
time has been, a cell.” E.B.
Wilson, 1925
Cells are Us
A person contains about 100 trillion cells.
That’s 100,000,000,000,000 or 1 x 1014
cells.
There are about 1,000 different cell types in
humans
Cells are tiny, measuring on average about
0.002 cm (20 um) across. That’s about
1250 cells per inch.
Red and
white blood
cells
nerve cell
How big are cells?
• Bacteria e.g. Eschericia coli (aka E.coli)
• Size=1 µm by 3 µm (one millionth of meter!)
• Human red blood cell = 8 µm
Largest cell = yolk of an ostrich egg
The Cell Theory (1838-1839)**
 All organisms are composed of one or more cells.
 Cells are the smallest living things.
Schleiden
 Cells arise only by division of previously existing cells.
http://www.youtube.com/watch?v=gEwzDydciWc&feature=related
Schwann
All cells today came from an original cell….
Bacteria on the Head of a Pin
Animal Cell
The Nucleus
Think of the nucleus as the cell’s
control center.
Two meters of
human DNA fits
into a nucleus
that’s 0.000005
meters across.
The Lysosome
Functions:
•Digesting food or cellular invaders
•Recycling cellular parts
The Mitochondrion
Energy!!
Mitochondria and Health
Plant Structures
The Chloroplast
The Solar Panel of the Plant Cell!
Two Other Unique Features of Plant Cells
The central
vacuole may
occupy 90%
of a plant
cell.
Cell Walls = Great Strength
Cytoplasm
The
Cytoplasm in
Action
A white
blood cell
using the
cytoplasm to
grab a
bacterium.
How do cells move?**
• Flagella
• Cilia
• False feet
http://www.youtube.com/watch?v=_k78AWnDaqA
http://www.youtube.com/watch?v=7pR7TNzJ_pA&feature=related
• http://www.youtube.com/watch?v=KxTYy
NEbVU4&feature=related
Cell movement
Two Different Types of Cells**
Prokaryotic cell
A eukaryotic cell
Us vs. Them Eukaryotes and
Prokaryotes
Eukaryotes
Prokaryotes
Amoeba
Zombie
Cells