A-LevelBiologyTransport in mammals9700/22 · Oct/Nov 2017 · Q66 Marks
Fig. 6.1 is a diagram of a vertical section through the mammalian heart. The labels Q to X represent valves and blood vessels of the heart. [Figure 6.1]
- (a)(i)State which label represents the valve that prevents the backflow of blood from the aorta into the ventricle.[1]
- (a)(ii)Name the blood vessel that carries oxygenated blood from the lungs to the heart and state which label represents this blood vessel.[2]
- (b)State precisely where the sinoatrial node is located.[1]
- (c)Explain the role of the atrioventricular node in the coordination of heart action.[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 2017). The mark or mark type is shown in brackets.
- [1] S ;
- [2] pulmonary vein ;
- R ;
- [1] wall of right atrium ; A muscle of right atrium
- [2] two from
- passes the, impulse / wave of excitation, to the Purkyne fibres / down the septum ; A Bundle of His R nerve impulse
- allows a (short) delay ;
- detail ;
- e.g. so atria contract before ventricles
- allows ventricles to fill
- so atria have, emptied / contracted, before ventricular contraction begins
- so atria and ventricles don't contract at the same time
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