O-LevelBiologyTransport in Humans5090/22 · Oct/Nov 2014 · Q110 Marks

Fig. 1.1 shows a kidney and its associated structures. The arrows show the direction of flow of fluids in these structures. [Figure 1.1]

(a)(i)Name the structure labelled A in Fig. 1.1.[1]
(a)(ii)Name the chamber of the heart through which blood in structure A last passed.[1]
(b)Table 1.1 shows the relative concentrations of various substances in structures B and C. Complete the table to show the possible concentrations of these substances in structure D. [Table 1.1][5]
(c)Explain how the relative concentrations of glucose might change in structures B, C and D in a person with diabetes.[3]

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Mark scheme

Marking points from the official mark scheme (Oct/Nov 2014). The mark or mark type is shown in brackets.

[1] (dorsal) aorta ;
[1] left ventricle ;
[5] (amino acids) 0.05 ;
(glucose) 0.10 to 0.15 ;
(mineral ions) 0.72 to 2.22 ;
(proteins) 8.00 ;
(urea) 0.03 to 2.03;
[max. 3] B would contain some/more/high (glucose) / C would contain more/high (glucose) / D would contain more/high (glucose) ;
lack of Insulin ;
glucose would not be converted into glycogen ;
kidney unable to/doesn't reabsorb all glucose ;

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