The small intestine is around 6-7m long and 2.5-3cm in diameter. It is so long compared to the large intestine to allow it to absorb nutrients and digest food. In addition to this, it is covered in small finger like protrusions called villi to increase its surface area and this increases the absorption ability of the small intestine. This increased surface area is required to absorb nutrients and... more

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Rachael Wood
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