biology gcse help

Roaayyyy

how does starch enter the blood? (6 marker question)

Reply 1

jelllyfiiish

Life & Style Forum Helper

Original post by Roaayyyy

how does starch enter the blood? (6 marker question)

Is the full question just “How does starch enter the blood?” Or is there more information attached?

This is my attempt:

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Starch is a large, insoluble molecules

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Therefore starch cannot be absorbed into the intestinal wall

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But when starch is broken down by the enzyme amylase, it can be smaller and soluble

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Amylase is a carbohydrase (enzyme) which breaks down starch into glucose and maltose

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Glucose the maltose are small and soluble molecules

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Therefore glucose and maltose can be absorbed into the intestinal wall to the blood stream

Reply 2

Tiny_spy

It could be to do with diffusion:

•Starch is broken down by amylase
•In the mouth and small intestine, into simple sugars (e.g glucose)
•These simple sugars are smaller, soluble molecules than starch
•Which are able to pass through the villi in the small intestine into the blood
•Moving by diffusion
•From an area of high simple sugar concentration (the small intestine) into an area of low simple sugar concentration (the blood)