(a) Draw a diagram of human alimentary canal and label the following parts:
(i) largest gland.
(ii) Gland that secretes digestive enzymes and hormone.
(iii) Part where HCl is produced.
(iv) Part where digested food is absorbed.
(b) What are villi? Explain their function in the digestive system.
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(b) Villi are small finger-like projections located in the walls of the small intestine. Their function is to increase the surface area in order to maximise the absorption of digested food.
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