Explain how I digested food gets absorbed into the blood
Answers
Explanation:
Absorption
Digested food molecules are absorbed in the small intestine. This means that they pass through the wall of the small intestine and into our bloodstream. Once there, the digested food molecules are carried around the body to where they are needed.
Only small, soluble substances can pass across the wall of the small intestine. Large insoluble substances cannot pass through. The slideshow shows how this happens:
Food in the small intestine, and the wall of the small intestine which divides it from the blood stream
Food molecules in the small intestine are too large to pass across its wall and into the bloodstream
Adaptations for absorption
Absorption across a surface happens quickly and efficiently if:
the surface is thin
its area is large
The inner wall of the small intestine has adaptation so that substances pass across it quickly and efficiently:
it has a thin wall, just one cell thick
it has many tiny villi to give a really big surface area
If the small intestine had a thick wall and a small surface area, a lot of digested food might pass out of the body before it had a chance to be absorbed.
The villi (one of them is called a villus) stick out and give a big surface area. They also contain blood capillaries to carry away the absorbed food molecules.
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Fibre roughage is not digested in the stomach.It directly enters the blood stream into the blood.
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