2.32 Absorption in the small intestine
Exam question
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Which feature of a villus gives a large surface area?
(1)Total for this question: 1 mark
2(e) NUTRITION · EXAM QUESTIONS
2.32 Absorption in the small intestine
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2.32 Absorption in the small intestine
Exam question
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Fatty acids and glycerol are absorbed mainly into which structure in a villus?
(1)Total for this question: 1 mark
2.32 Absorption in the small intestine
Exam question
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Through which blood vessel does glucose go from the small intestine to the liver?
(1)Total for this question: 1 mark
2.32 Absorption in the small intestine
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Describe how the structure of a villus is adapted for absorption.
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Total for this question: 4 marks
2.32 Absorption in the small intestine
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Explain why a rich capillary network in each villus speeds up absorption.
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Total for this question: 2 marks
2.32 Absorption in the small intestine
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Explain why the small intestine is very long.
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Total for this question: 2 marks
2.32 Absorption in the small intestine
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Explain why the cells lining a villus have many mitochondria.
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Total for this question: 2 marks
2.32 Absorption in the small intestine
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Explain how glucose is absorbed from the small intestine when its concentration in the gut is lower than in the blood.
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Total for this question: 3 marks
2.32 Absorption in the small intestine
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Coeliac disease damages the villi, making them flatter. Suggest why people with untreated coeliac disease lose weight.
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Total for this question: 2 marks
2.32 Absorption in the small intestine
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Name two substances absorbed into the blood capillaries of the villi.
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Total for this question: 2 marks
2.32 Absorption in the small intestine
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Describe what happens to the products of fat digestion after they enter a villus.
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Total for this question: 2 marks
2.32 Absorption in the small intestine
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Explain why villi are found in the small intestine but not in the stomach.
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Total for this question: 2 marks
2.32 Absorption in the small intestine
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The small intestine has a surface area of about 32 m². Villi and microvilli increase this from a flat tube of 0.5 m². Calculate how many times larger the surface area is.
(2)timesTotal for this question: 2 marks
2.32 Absorption in the small intestine
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Describe the role of the hepatic portal vein.
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Total for this question: 2 marks
2.32 Absorption in the small intestine
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Explain why blood in the hepatic portal vein carries more glucose after a meal than before it.
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Total for this question: 2 marks