Post on 18-Jan-2018
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DO NOW (WRITE Q AND A IN SOURCEBOOK)
1. What are some things that pass through a window screen?
2. What are some things that cannot pass through a window screen? Why is it important to keep these things from moving through the screen?
3. The cell is surrounded by a membrane which regulates what enters and leaves the cell. Why is it important to regulate what moves into and out of a cell?
MEMBRANE AND TRANSPORTVideo Introduction: The Cell Membrane Kinghttps://www.youtube.com/watch?v=6fhbbFd4icY&list=UUb2GCoLSBXjmI_Qj1vk-44g
THE CELL MEMBRANE selectively permeable:
Let in stuff they need, kick out stuff they don’t need.
To get into the cell, materials must pass through the cell membrane.
Two reasons this is important:1. How cells acquire what they need and get rid of what they don’t2. How cells communicate with one another
PHOSPHOLIPID BILAYER Cell membranes are made out of
phospholipids. There are hydrophilic (water loving) and
hydrophobic (water hating) parts.
TYPES OF TRANSPORT Two categories of transport: active and
passive Passive transport doesn’t require any
energy. Diffusion: transport of stuff (oxygen). Particles want to spread out. Osmosis: transport of water. Osmosis and Diffusion are examples of
PASSIVE transport. They don’t require any energy.
ACTIVE TRANSPORT Channel proteins act like hallways. Active transport moves things in the opposite
direction of the concentration gradient.
SOLUTIONS: 3 TYPES Solution: something dissolved in water
(salt, the solute)
HypertonicHypotonicIsotonic
The kidneys regulate the concentration of blood plasma.
HYPERTONIC the solution has a higher solute
concentration than the cell water moves out
HYPOTONIC the solution has a lower solute concentration
than the cell water moves in
ISOTONIC concentration of
solute same inside cell as outside (balanced)
water moves in and out
When things transport to attempt to become isotonic it’s called: moving across the concentration gradient
Blood
DO NOW: COPY THE PICTURE. LABEL HYPERTONIC, HYPOTONIC, OR ISOTONIC. DRAW AN ARROW SHOWING THE DIRECTION THE WATER WILL MOVE.
DO NOW: IN SOURCEBOOKS The cell membrane is made up of a _____
bilayer.A) CarbohydrateB) LipidC) ProteinD) None of the Above
True or False: All cells have a cell membrane. The lipids in the bilayer have tails that are
_____ meaning that they repel (or do not like) water.
True or False: Some molecules can pass through the bilayer without help.
WRITING TO WIN: FOCUSED FREE WRITE 6-7 sentences 5-6 key terms
Prompt: I am _______, the lipid bilayer.
Key terms:Cell
membranestructure surround hydrophilic
lipids movement semipermiable
properties
bilayer Double hydrophobic proteins
DO NOW: Mrs. Stoops has a saltwater fish (Nemo) that
she put into a freshwater fish tank. What will happen to the fish and why? Draw a sketch to illustrate your answer.
Hint: HypertonicIsotonicHypotonicSwellShrinkBalanced
VOCABULARY BINGO Homeostasis Phospholipid Fluid mosaic
model Cell membrane Selective
permeability Receptors Diffusion Concentration
gradient
Osmosis Hypertonic Hypotonic Passive transport Facilitated
diffusion Isotonic Active transport Phagocytosis Endocytosis Exocytosis
Hydrophilic Hydrophobic Kidneys Protein channel Pinocytosis Turgid