notes – 6.1 diffusion and osmosis. 6.1 the structure and function of the cell membrane the cell...
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Notes – 6.1
Diffusion and Osmosis
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6.1 The Structure and Function of the Cell Membrane
• The cell membrane has many functions.– protection– obtaining food– ridding wastes– communication– interaction with other
cellsA soap bubble is like a cell membrane.
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6.1 The Structure and Function of the Cell Membrane
• The cell membrane is made of several types of molecules.
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6.1 Diffusion• Molecules move across the cell membrane by a process called
diffusion.• Diffusion is the movement of molecules from areas of greater
concentration to areas of lesser concentration.
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6.1 Diffusion• Molecules move
into or out of the cell until there is an equal number on both sides of the cell membrane.
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6.1 Diffusion• Water molecules are
small enough to pass through the cell membrane by diffusion.
• Osmosis is the diffusion of water across the cell membrane.
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6.1 Other types of transport• Larger molecules
like sugars, starches, and proteins sometimes diffuse through protein channels.
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6.1 Active transport• Active transport is a process that allows molecules to move
across the cell membrane from lower to higher concentrations.
• To do this requires energy.
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6.1 Other types of transport
• A cell can take in large particles of food by “engulfing” them.
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6.1 Why are cells so small?• To understand why the volume of a cell increases
faster than its surface area, let’s imagine a perfectly square cell.
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6.1 Why are cells so small?• Which cell type has a higher volume to
surface area ratio?
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Now do your Amoeba Sisters –
Osmosis & Diffusion worksheet