Osmosis and DiffusionPassive Transport

Please pause to answer all questions asked during this video.

Record all answers on the paper provided.

Prediction

• In the box provided predict what this diagram would look like after a period of one hour.

Passive Transport

• There are two types of passive transport:• Diffusion• Osmosis

Diffusion

• Diffusion is a form of passive transport.

• Molecules “diffuse” or move down the concentration gradient until an equilibrium is reached.

• What is a concentration gradient?• There are two different

concentrations to consider:• Concentration of solvent (Water)• Concentration of Solute (What is

dissolved or suspended in solvent

• GIF of Diffusion of food coloring in water.

• Due to random movement of water molecules.

• Molecules move due to energy.

• What do you think would happen if the water was heated?• Rate of diffusion would increase.

Osmosis

• Cell membrane is a semipermeable membrane.

• Cells use a separate process called active transport to move larger molecules in and out of the cell.

• Water (solvent) outside of the cell will move from high concentration of solvent to low concentration of solvent.

• Osmosis is another form of passive transport.

• Osmosis is the diffusion of water molecules across a semipermeable membrane.• What is a semipermeable

membrane?

Osmosis

• Example of Semipermeable membrane and 2 Sugar water concentrations

• Make a drawing to predict what will happen after an hour.

• Make a drawing to predict what will happen after an hour.

Osmosis

• Another example of osmosis using a cell

• Make a drawing to predict what will happen after an hour.

Prediction

• Same diagram as first prediction • Look back at the prediction you made in box one.

• Was your prediction correct, why or why not?

Effects of Osmosis

Effects of Osmosis

Effects of Osmosis

• Example with Cells

Effects of Osmosis

• Example with Cells