O-LevelBiologyTransport in Humans5090/22 · Oct/Nov 2016 · Q49 Marks
Fig. 4.1 shows a section through a heart connected to what is described as an LV Assist Device. [Figure 4.1]
- (a)(i)Use Fig. 4.1 to suggest why the device is called an LV Assist Device.[1]
- (a)(ii)Name the type of tissue through which tube M passes.[1]
- (a)(iii)Name the blood vessel into which tube N is inserted.[1]
- (b)(i)Draw arrows on Fig. 4.1 to show the direction of blood flow in the blood vessels that carry blood into the heart.[2]
- (b)(ii)Draw arrows on Fig. 4.1 to show the direction of blood flow through the LV Assist Device.[1]
- (c)Name the valve that is bypassed by blood flowing through the LV Assist Device.[1]
- (d)Sometimes the pulmonary circulation requires artificial assistance. Suggest and describe where, under these circumstances, an Assist Device would be fitted.[2]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2016). The mark or mark type is shown in brackets.
- [1] Left Ventricle / helps blood flow or pressure ;
- [1] muscle;
- [1] aorta;
- [2] arrow in or towards heart in vena(e) cava(e);
- arrow towards heart in pulmonary vein(s);
- [1] arrow right to left through LVAssist Device / in tube M/N;
- [1] aortic/semi-lunar ;
- [2] right ventricle ;
- pulmonary artery;
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