Which of the following organ is the longest part of the alimentary canal in the humans?
Small intestine
The alimentary canal runs from the mouth to the anus: buccal cavity, pharynx, oesophagus, stomach, small intestine, large intestine and anus.
The small intestine is the longest part, about 6-7 metres long in an adult. It completes digestion and absorbs nutrients through villi.
The oesophagus is only about 25 cm long and the buccal cavity is short. The liver is a digestive gland, not a part of the canal itself. So the longest part is the small intestine.
Hence, Small intestine.
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