Cellular Transport How Your Cells Eat, Drink and be Merry! EQ: Describe the structure of the cell membrane.

lipids proteins Which two major organic compounds were found in cell membranes?

How do nutrients and water get into cells? cell membrane Channel Protein Cell Membrane Lipid Outside of Cell Inside of Cell Marker Protein Receptor Protein

You eat and drink so that your cells can eat and drink! Cells must take in water and nutrients in order to maintain HOMEOSTASIS Mmm…..

Oil (lipid) and water don’t mix – thank goodness! Water is essential for life! Every cell in your body is “swimming” in a solution with a very high water concentration. The lipid (oily) layer around cell maintains the cell as a unit, making sure it doesn’t dissolve away.

What is the cell membrane made of? Proteins and Lipids lipid bilayer: two layers of lipids with proteins scattered through it

Cell Membrane Proteins Receptor: receive chemical messages Channel: allow things in and out Marker: identify the cell

Substances are TRANSPORTED into and out of cells across the cell membrane Two Types of Transport: –Passive –Active

What is Passive Transport? 1. Requires no energy from cell. 2. Molecules move from high concentration to low concentration. 3. Molecules move with the concentration gradient.

Diffusion: when substances move from high to low concentrations in order to reach equilibrium

Diffusion through a cell membrane

Osmosis: when WATER moves from high to low concentration in order to reach equilibrium (a type of diffusion) Cell Membrane

How are these big guys going to get across? I’m a Channel, I can help!

Explain what is happening

There are 3 types of passive transport: 1. diffusion 2. osmosis 3. facilitated diffusion

What is the movement of water called? Word from unit Picture

How is Active Transport different? 1.Active transport requires energy. 1.Solutes move from low concentration to high concentration 1.Molecules move against concentration gradient.

Cell Pumps: Active Transport The sodium-potassium pump is a classic example of a cell using active transport to move substances against the concentration gradient. It is vital in proper functioning of nerve cells. Click on the diagram to see an animation of a potassium-sodium pump at work. On the website, scroll down to see the animation. It can be slowed down or stopped at will.

Form Food Vacuole Lysosomes Come To Vacuole Digestion Your white bloods cells also do this. This is the ingestion of large particles using energy. Is it active or passive transport? Trap Food Amoeba

Amoeba engulfing a protist. White blood cells engulf bacteria and viruses in the same way. Is this active or passive transport?

What would happen to the animal cells? 100% Distilled Water 80% H 2 O 70% Water 30% Solute 80% H 2 O 80% Water 20% Solute 80% H 2 O

Which way did the water move? 100% Distilled Water 80% H 2 O Why did the cell get so big?

Which way did the water move? 80% Water 20% Dissolved Substances 80% H 2 O Why did the cell stay the same size?

Which way did the water move? 70% Water 30% Dissolved Substances 80% H 2 O Why did the cell get so small?

Which way would the solute be moving if this were active transport? 90% Water 10% Solute 80% H 2 O 20 % solute Why would it move that direction?

Cellular Transport cont. EQ: How can you decide if a solution is hypertonic, hypotonic, or isotonic?

Hypertonic Solution Greater amount of solutes (dissolved substances) in the solution compared to the cell. 70% Water 30% Solutes 20% solute

Hypotonic Solution Fewer solutes (dissolved substances) in the solution as compared to the cell. 100% Water 0% solutes 20% solutes

Isotonic Solution Same amount of solutes inside and outside the cell. 80% Water 20% Solutes 80% H 2 O

Remember the potato lab???? What type of solution was the saltwater solution? The water?