✓State that substances enter and leave cells through cell surface membranes.
✓Define the terms diffusion, osmosis and active transport.
✓State the difference between diffusion and osmosis.
✓Explain the importance of diffusion, osmosis and active transport in living organisms.
⏱ 0 mins🎯 38 marks
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In many Caribbean homes, fish is preserved by rubbing it with salt or soaking it in brine. After a while, the fish looks smaller and drier. At the same time, when you soak the same salted fish in fresh water overnight, it swells and softens. What invisible process is happening between the fish cells and the salty or fresh water outside? The answer lies in how substances move across cell surface membranes. TIP: Always picture a cell surface membrane as a “smart gatekeeper” controlling what enters and leaves the cell.
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Before today, had you studied cell surface membranes in school?
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In many Caribbean homes, fish is preserved by rubbing it with salt or soaking it in brine. After a while, the fish looks smaller and drier. At the same time, when you soak the same salted fish in fresh water overnight, it swells and softens. What invisible process is happening between the fish cells and the salty or fresh water outside? The answer lies in how substances move across cell surface membranes. TIP: Always picture a cell surface membrane as a “smart gatekeeper” controlling what enters and leaves the cell.