O-LevelBiologyTransport in Humans5090/22 · May/June 2022 · Q810 Marks
(a) Compare the pulmonary artery and the vena cava in terms of their structure and function. [6] (b) Explain the role of platelets and the importance of this role. [4]
- (a)Compare the pulmonary artery and the vena cava in terms of their structure and function.[6]
- (b)Explain the role of platelets and the importance of this role.[4]
Mark scheme
Marking points from the official mark scheme (May/June 2022). The mark or mark type is shown in brackets.
- [1] both carry deoxygenated blood ;
- [1] blood in pulmonary artery from + heart / right ventricle ;
- [1] blood in vena cava from body ;
- [1] blood in pulmonary artery to lungs ;
- [1] blood in vena cava to + heart / right atrium ;
- [1] vena cava + vein ;
- [1] vena cava + valve / valves ;
- [1] pulmonary artery + thick wall / muscular wall / elastic wall ;
- [1] pulmonary artery + narrow lumen / small lumen ;
- [1] pulmonary artery + high pressure ;
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