4.1 Cell Biology Lesson 8.

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Presentation transcript:

4.1 Cell Biology Lesson 8

Baseline (flightpath D): Know that molecules move into and out of a cell through its membrane by a process called diffusion and give an example of one substance that does this. Further (flightpath C): Describe how relative concentrations affect the direction of diffusion through the cell membrane and give an example of a factor that affects the rate. Challenge (flightpath B&A): Explain in detail factors that affect the rate of diffusion and how the body utilises this to increase the diffusion rate of important substances.

Osmosis Osmosis is very similar to diffusion except that it only deals with the movement of water molecules across a semi-permeable membrane. Water moves from a low solute concentration to a high solute concentration.

Which side has the highest solute concentration? Osmosis occurs across a semi permeable membrane which has tiny holes in it. These holes are small enough for water molecules to pass through but larger molecules cannot pass through Water molecules = Solute molecules = Which side has the highest solute concentration?

High solute concentration Low solute concentration Osmosis occurs across a semi permeable membrane which has tiny holes in it. These holes are small enough for water molecules to pass through but larger molecules cannot pass through Water molecules = Solute molecules = High solute concentration Low solute concentration

Which way will the water travel? Nature wants to balance the solute concentration on both sides of a semi-permeable membrane. Water will travel from one side to other to make the concentration the same on both sides. Water molecules = Solute molecules = Which way will the water travel? High solute concentration Low solute concentration

Which way will the water travel? Nature wants to balance the solute concentration on both sides of a semi-permeable membrane. Water will travel from one side to other to make the concentration the same on both sides. Water molecules = Solute molecules = Which way will the water travel? The concentrations are now equal. High solute concentration Low solute concentration

Predict which way the water will move in both examples Visking tubing containing concentrated sugar solution in a beaker of distilled water 1 Visking tubing containing distilled water in a beaker of concentrated sugar solution. 2 Predict which way the water will move in both examples and then set the experiment up yourself

Isotonic solutions Isotonic solutions are two solutions that have the same concentration of a solute. Hypertonic solution Hypertonic solution is one of two solutions that has a higher concentration of a solute. Hypotonic solution Hypotonic solution is one of two solutions that has a lower concentration of a solute.