EASY biology question,but I have difficulty remembering concept

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susiebe
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'Some people cannot digest lactose when they are adult. They could digest lactose when they were children. Use your knowledge of water potential to explain why these adults get diarrhoea when they drink milk.'




Can someone please answer this in a really easy way to get me to remember!
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Lucyyy17
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(Original post by susiebe)
'Some people cannot digest lactose when they are adult. They could digest lactose when they were children. Use your knowledge of water potential to explain why these adults get diarrhoea when they drink milk.'




Can someone please answer this in a really easy way to get me to remember!
I think it is because the lactose isn’t digested so remains in the faeces, this reduces the water potential in the faeces therefore water moves into the faeces via osmosis down the concentration gradient, making them more watery. Hope that helps
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replaythat
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Yes right, lactose is a sugar and is a solute (made up of glucose and galactose), solutes lower water potential, becuase it is not digested it remains there and so a diffusion gradient is established - water can them move from an area of high concentration gradient to a low concentration - which makes it very watery
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susiebe
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Great answers,many thanks!

Im finding if i draw myself diagrams of where the higher concentration of solutes are then I can see which way the water molecules move via osmosis.
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