Why is the small intestine able to fit into a compact space within the human body?
Extensive coiling
The small intestine is the longest part of the alimentary canal, about 6-7 m long in an adult.
It is extensively coiled and folded, which lets this long tube fit inside the limited space of the abdominal cavity.
A large diameter, thick walls or a rigid lining would make it bulkier and less flexible, not more compact.
Hence, the answer is extensive coiling.
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