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