(a) State where in the body most absorption of nutrients takes place. [1] (b) Describe two features of the small intestine that help it to absorb nutrients ...
Question 1 Report
(a) State where in the body most absorption of nutrients takes place. [1]
(b) Describe two features of the small intestine that help it to absorb nutrients efficiently. [4]
(c) Name the end products of the digestion of the following nutrients:
(i) protein [1]
(ii) starch [1]
(iii) fat [1]
Answer Details
(a) State where most absorption takes place. [1]
- The small intestine (1)
(b) Describe two features that help absorption. [4]
Two marks per feature (max 4):
- The inner wall is covered in tiny finger-like projections called villi (1), which increase the surface area available for absorption (1).
- The wall of each villus is very thin, only one cell thick (1), which allows nutrients to pass through quickly into the blood (1).
- The small intestine is very long (about 6 metres) (1), which gives a large area and plenty of time for absorption to take place (1).
- Each villus has a good blood supply (1), which carries absorbed nutrients away quickly, maintaining a concentration gradient (1).
(c) Name the end products of digestion. [3]
(i) Protein is broken down into amino acids (1).
(ii) Starch is broken down into glucose (simple sugars) (1).
(iii) Fat is broken down into fatty acids and glycerol (1).
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