Question

(a) Draw a diagram of human alimentary canal and label – gall bladder, pancreas, liver and small intestine.

(b) Give two reasons to explain why absolution of digested food occurs mainly in the small intestine?

Answer 1

(a) Human alimentary canal diagram:

(b) The small intestine is the most important part of the digestive system. Maximum absorption occurs in the small intestine because of the following reasons:

(i) Digestion is completed in the small intestine because the inner lining of the small intestine is provided with villi which increase the surface area for absorption of digested food.

(ii) Wall of the intestine is richly supplied with blood vessels which assimilate the absorbed food to the other parts of the body.