Diffusion & Osmosis October 24, 2007 Ms. Manaktola.

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Presentation transcript:

Diffusion & Osmosis October 24, 2007 Ms. Manaktola

demonstration Questions: What happened? Why did it happen? Microscopic view

diffusion Diffusion is the movement of solute molecules from an area of high concentration to an area of low concentration. Animation

osmosis Osmosis is the passage of water across the membrane from an area of high concentration to an area of low concentration Similar to diffusion, but not the same! Osmosis only pertains to water molecules

osmosis HYPERTONIC and HYPOTONIC are important terms When we compare two solutions, a HYPERTONIC solution is the solution with a greater solute concentration relative to the HYPOTONIC solution REVIEW: What is a solute?

osmosis

In osmosis, water travels from HYPOTONIC  HYPERTONIC (less solute) (more solute)

Osmosis and cells What do you think will happen if I take a blood cell and place it in a beaker of water?

Osmosis and cells What do you think will happen if I take a blood cell and place it in a beaker of very salty water?

Osmosis and cells

Why do your fingers wrinkle when you’ve been in the pool? Your homework!

Your ticket out the door On the provided diagram, make a diagram to illustrate diffusion and osmosis. Label if necessary.