Fig. 1 shows the route taken by food through the digestive system of a person who has had an operation to remove a diseased gall bladder. The person's liver...
Question 1 Report
Fig. 1 shows the route taken by food through the digestive system of a person who has had an operation to remove a diseased gall bladder. The person's liver still produces bile, but it is released directly into the small intestine. The arrows show movement of food, not movement of bile.
(a) Name the organs labelled R and S. [2]
(b) State the main function of the stomach in digestion. [2]
(c) Explain why removal of the gall bladder does not stop fat digestion completely. [3]
(d) Which type of enzyme digests fat in the small intestine? [1]
(e) Describe why digested food, rather than undigested food, can enter the blood. [1]
Answer Details
(a) R is the liver and S is the small intestine. [2 marks]
(b) The stomach churns and mixes food and begins protein digestion, using protease in acidic conditions. [2 marks]
(c) Removing the gall bladder does not stop fat digestion because the liver still produces bile and bile still enters the small intestine. Bile emulsifies fat, breaking it into small droplets and increasing the surface area for lipase. [3 marks] The gall bladder stores bile; it does not make it.
(d) Lipase digests fat in the small intestine. [1 mark]
(e) Digested food consists of small, soluble molecules, so these can pass through the intestinal wall into the blood. [1 mark]
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