Index / Human Anatomy / Digestive System
Human Anatomy
Digestive System
Mouth-to-anus processing tract
Nine metres of muscular tube plus liver, pancreas, and gallbladder. Mechanical and enzymatic digestion break food down; absorptive villi extract nutrients over hours.
Key specifications
Length
~9 m
Transit
24–72 h
Small bowel
~7.5 m
Microbiome
~39 trillion
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