Same chapter3 marksDifficulty: Medium
State two functions of bile, and say why bile is not called a digestive juice.
The Digestive System
3 marksDifficulty: Medium
How is the small intestine adapted for absorption?
Original Khojo Papers practice question — not from a past board paper.
Answer
The small intestine is very long and its inner wall is thrown into folds bearing millions of finger-like villi, each covered with microvilli, which together give an enormous surface area. Each villus has a thin single-layered wall, a dense network of blood capillaries and a lacteal, so absorbed food passes quickly into the blood and lymph.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
The rich blood supply keeps the concentration gradient steep.
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