Transcript White blood cells

It’s Friday – yay!!
Please do the following:
• pick up the handout from the front table
• pick up glue and a highlighter
• have out your notebook
Observe the two types of cells. List 4 –
6 similarities and differences on the
left page of your notebook .
Not all cells are created equal…
• We know the difference between a plant
and animal cell, but are all plants and
animals exactly the same?
Why Not?
Cell Differentiation
What makes us so different, but
still the same.
http://www.youtube.co
m/watch?v=cyaVEotY
sY0
How to “mark the text”
1. # the paragraphs
2. Circle vocabulary
3. Highlight definitions
4. Underline facts
What is cell differentiation?
• cellular
differentiation is
the process by
which a less
specialized cell
becomes a
more
specialized cell
type.
Why differentiate cells?
• Because the various cells of each plant
and animals need to perform different
functions!
– Differentiation dramatically changes a cell's
size, shape, membrane potential, metabolic
activity, and responsiveness to signals.
How do cells differentiate?
• Cellular differentiation almost never
involves a change in the DNA sequence
itself.
– Thus, different cells can have very different
physical characteristics despite having the
same genome
• Different cells use different parts of the
genetic information they contain
– Example: Muscle cells differ from blood cells
because different genes are activated
Some different plant cells
• Roots, Stems,
and leaves need
to perform
different
functions, so the
cells will be
different.
Leaf cells
• Leaves main role is
performing
photosynthesis
(absorb nutrients from
the air & generate
glucose using energy
from the sun)
• protect cells from
drying out
Plant Stem Cells
• Plant Stem cells need to
be able to transport
water and nutrients to
various parts of the plant.
• These cells form clusters
of tubes for transport.
– The tubes are known as
Xylem and Phloem.
– They provide structure
for the plant (thick cell
walls), just like the
skeleton provides
structure for animals.
Root cells
• Root cells need to be
able to grow in the
search for and absorb
water & minerals.
Some different animal cells
• Blood, muscle,
and epithelium
need to perform
different
functions, so the
cells will be
different.
Muscle cells
• Muscle cells
are designed
to contract
and relax
allowing for
movement.
Nerve cells
• Nerve cells are
designed to
receive and
transmit impulses
from one area to
another.
Blood
• Blood is
responsible
for
transporting
various
materials to
and from the
cells.
•It also patrols the body
as part of the defense
system.
Blood
• Red blood cells are
responsible for transporting
oxygen to cells throughout
the body.
– These cells have NO nucleus.
Blood
• Platelets are critical for
clotting when blood vessels
are injured.
• White blood cells are the
bodies defenders against
the invaders such as
bacteria.
• Epithelial cells
make up the
tissues
covering the
body as well as
lining the
organs and
cavities of the
body.
• Acts as a
protective
barrier!
Epithelial cells