O-LevelBiologyTransport in Humans5090/22 · May/June 2015 · Q311 Marks

Fig. 3.1 shows the blood supply to cells in the liver. [Figure 3.1]

(a)(i)Name the cells labelled C and D in Fig. 3.1. C ......................................................................................................................................................................... D .........................................................................................................................................................................[2]
(a)(ii)The arrow in Fig. 3.1 shows the movement of substances from the liver cells into the capillary. Name three substances that move in the direction shown. 1 2 3[3]
(b)(i)Describe the effect of adrenaline on liver cells.[2]
(b)(ii)State a situation in which this might occur.[1]
(c)(i)Sometimes the liver is unable to remove glucose from the blood. This condition is called diabetes. State two symptoms of this condition. 1 2[2]
(c)(ii)State how this condition is treated.[1]

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Mark scheme

Marking points from the official mark scheme (May/June 2015). The mark or mark type is shown in brackets.

[2] (a)(i) C – RBC/erythrocyte ;
[2] (a)(i) D – WBC/phagocyte/polymorph/neutrophil ; A polymorph/neutrophil
[max 3] (a)(ii) 1. urea ; A uric acid/creatinine
[max 3] (a)(ii) 2. CO2 ;
[max 3] (a)(ii) 3. iron ;
[max 3] (a)(ii) 4. glucose ;
[max 3] (a)(ii) 5. (named) vitamins ;
[max 3] (a)(ii) 6. water ;
[max 2] (b)(i) 1. glycogen ;
[max 2] (b)(i) 2. (broken down to) glucose ;
[max 2] (b)(i) 3. (glucose) released/carried in blood/increases blood glucose level; Ig ref. to glucagon/pancreas
[1] (b)(ii) fight/flight/fright (or described) ;
[2] (c)(i) increased/high + blood glucose / sugar level;
[2] (c)(i) presence of glucose/sugar + in urine ;
[max 1] (c)(ii) 1. insulin ;
[max 1] (c)(ii) 2. controlled CHO/sugar in diet ;

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