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3.4 Diffusion and Osmosis

3.4 Diffusion and Osmosis. KEY CONCEPT Materials move across membranes because of concentration differences. 3.4 Diffusion and Osmosis. Passive transport does not require energy input from a cell. Molecules can move across the cell membrane through passive transport.

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3.4 Diffusion and Osmosis

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

  2. 3.4 Diffusion and Osmosis • Passive transport does not require energy input from a cell. • Molecules can move across the cell membrane through passive transport. • There are two types of passive transport. • diffusion • osmosis

  3. 3.4 Diffusion and Osmosis • Diffusion and osmosis are types of passive transport. • Molecules diffuse down a concentration gradient.

  4. 3.4 Diffusion and Osmosis • Diffusion and osmosis are types of passive transport. • Osmosis is the diffusion of water molecules across a semipermeable membrane.

  5. 3.4 Diffusion and Osmosis • Diffusion and osmosis are types of passive transport. • There are three types of solutions. • isotonic • hypertonic • hypotonic

  6. 3.4 Diffusion and Osmosis • Some molecules can only diffuse through transport proteins. • Some molecules cannot easily diffuse across the cell membrane. • Facilitated diffusion is diffusion through transport proteins.

  7. Factors that affect rate of diffusion? • Take some time to think about various factors that could affect the rate of diffusion. • Temperature • Particle Size • pH • Solute concentration

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