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Human Digestive System — Free MYP3 Sciences Practice Questions
1QuestionAbsorption of Nutrients in the Small IntestineConcept Practice
2 marks~3 minCriterion A
The diagram shows a villus from the small intestine. Structure X is found on the surface of the epithelial cells lining the villus.
a
Identify structure X. [1]
b
Describe how structure X increases the efficiency of nutrient absorption. [1]
Solutions
2QuestionAbsorption of Nutrients in the Small IntestineAssessment Practice
2 marks~3 minCriterion D
Short bowel syndrome is a condition in which a portion of the small intestine is surgically removed, reducing the length available for digestion.
Explain the significance of villi for a patient with short bowel syndrome. [2]
Explain the significance of villi for a patient with short bowel syndrome. [2]
Solutions
3QuestionAbsorption of Nutrients in the Small IntestineConcept Practice
3 marks~5 minCriterion B
The table below shows data for three sections of the small intestine.
| Section | Villi per | Surface area () |
|---|---|---|
| Duodenum | 15 | 30 |
| Jejunum | 25 | 60 |
| Ileum | 40 | 90 |
a
State what happens to the surface area of the small intestine as the number of villi per increases. [1]
b
Explain how villi increase the surface area of the small intestine. [1]
c
Analyse how the data suggest that the ileum is the most efficient section for nutrient absorption. [1]
Solutions
4QuestionAbsorption of Nutrients in the Small IntestineAssessment Practice
3 marks~5 minCriterion C
The diagram below shows a villus from the lining of the small intestine. An arrow indicates the microvilli on the surface of an epithelial cell.
a
Describe the function of microvilli in the small intestine. [1]
b
Explain how the structure of microvilli allows nutrients to be absorbed more efficiently. [1]
c
A student claims that removing microvilli would reduce nutrient absorption but would not affect the rate of absorption. Evaluate whether this claim is correct. [1]
Solutions
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