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3.4 Diffusion and Osmosis KEY CONCEPT Materials move across membranes because of concentration differences.

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Presentation on theme: "3.4 Diffusion and Osmosis KEY CONCEPT Materials move across membranes because of concentration differences."— Presentation transcript:

1 3.4 Diffusion and Osmosis KEY CONCEPT Materials move across membranes because of concentration differences.

2 3.4 Diffusion and Osmosis Passive transport = no energy
Molecules can move across the cell membrane through passive transport. 2 types Diffusion- particles Osmosis- water

3 3.4 Diffusion and Osmosis Molecules diffuse down a concentration gradient.

4 3.4 Diffusion and Osmosis Osmosis is the diffusion of water molecules across a semipermeable membrane.

5 3.4 Diffusion and Osmosis There are three types of solutions. isotonic
hypertonic hypotonic

6 3.4 Diffusion and Osmosis Facilitated diffusion is diffusion through transport proteins.

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