Alimentary canal: structure and regions
Human digestive system · Biology
Study notes
Swallow a bite of roti and trace its 8-metre journey: chewed in the mouth, squeezed down the 25-cm oesophagus by peristalsis, churned 3–4 hours in the stomach's acid bath, then a 6-metre small intestine absorbs nutrients through millions of villi, while the 1.5-metre large intestine reclaims water — total transit 24–72 hours.