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WARM UP:WEEKLYFORMATIVEASSESSMENTComplete the chart covering viral vs. bacterial pathogens!
5 minutes
WHAT IS ONE CRITICAL THING THESE PEOPLEDO IN ORDER TO “PLANK” ON AN OBJECT?
PLANKING:An act of BALANCING your body on any given object.
*You must keep your arms down to your sides and your head down.
Raise your hand….
Predict what you think HOMEOSTASIS means for a cell.
Look at your notebooks…
Which ORGANELLE is responsible for maintaining homeostasis?!!
(hint: it does this by controlling what enters and leaves the cell)
What if I told you… You are made of mostly water! IN and OUT of your cells is water-based.
The cell membrane has both water-LOVING and water-FEARING properties so it must be shaped a certain way!
Today we are building a cell (plasma) membrane!
Cut and organize the pieces of the cell membrane in the placement you predict.
Put it in the MIDDLE of the notebook, across two pages: 30-31
DON’T GLUE YET!
HINT: THE WATER-FEARING PARTS WILL FACE EACH OTHER!
Fluid surrounds the membrane. Label “INTRACELLULAR” and “EXTRACELLULAR”.
What side of the membrane do you predict the organelles to go?
DRAW and LABEL these organelles where they belong: nucleus, ribosomes, mitochondria
Fluid surrounds the membrane.
If AQUEOUS means made of mostly WATER…
Which part of the cell should be AQUEOUS, inside or outside the cell? Or both?
LABEL “AQUEOUS (WATER-BASED) ENVIRONMENT” where it belongs!
So… We talked about digestion last six weeks.
After the polymers get broken down into monomers in the digestive system…..What happens to these molecules after they are absorbed?
Where do these molecules go?
HOW DO THEY GET INTO OUR CELLS?!
Cell transport Every multi-cellular organism is made of specialized
cells (Red blood cells, muscle cells, nerve cells)
Each cell must perform an important life function
The cell membrane is important.
The cell membrane will allow things to enter and leave the cell. This is called CELL TRANSPORT.
Have you ever wondered why your dog pants on hot days?
It's because your dog is trying to maintain homeostasis.
Homeostasis is a word used to describe how a living organism regulates its internal environment to maintain stability
(equilibrium = balance).
How do living things maintain homeostasis?
When your body temperature begins to rise, what happens? *You begin to sweat. *Sweating is your body's way of cooling down =
Dogs…..
do not have sweat glands SO they pant. Dogs have just a few sweat glands in their
paws, so no matter how much they sweat; sweating could never cool them off.
That's where the tongue-hanging out, mouth-open dog panting comes in.
They are maintaining balance
Cell Membranecharacteristics: The cell (plasma) membrane regulates what
enters and leaves the cell (like a body guard) It is responsible for maintaining homeostasis in
that way. There are a few ways to describe the
membrane: phospholipid bilayer semi permeable Fluid mosaic model
phospholipid bilayer : the membrane is composed of TWO layers of phospholipids, forming a bilayer. The tails face each other.
semi (selectively) permeable: the membrane only allows certain particles to pass through, not others.
Fluid mosaic model: the membrane looks “fluid-like” because it is flexible.
Cell Membranecharacteristics:
What is a PHOSPHOLIPID? A lipid molecule with a PHOSPHATE
head and TWO FATTY ACID tails. The phosphate heads are
HYDROPHILIC and love water. The fatty acid tails are
HYDROPHOBIC and hate water, so they face each other when forming the layer!
On your membrane, LABEL: THE PHOSPHATE HEADS FATTY ACID TAILS Hydrophilic zone hydrophobic zone
Cell Membrane Structure
Label your cell membrane!
Proteins
Proteinchannel Lipid bilayer
Carbohydratechains
Phospholipids
What molecules are the cell membrane composed of?
* Proteins – Aid in transport* Phospholipids – make up the double layer*Surface carbohydrates – allow
for cell recognition & signaling
