Question 23M.2.SL.TZ1.3
| Date | May 2023 | Marks available | [Maximum mark: 4] | Reference code | 23M.2.SL.TZ1.3 |
| Level | SL | Paper | 2 | Time zone | TZ1 |
| Command term | Annotate, Explain, Identify | Question number | 3 | Adapted from | N/A |
The diagram shows the structure of the human heart.
[Source: CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=606903. Open access.]
Annotate the diagram by adding arrows to show how deoxygenated blood enters the heart.
[1]
arrows added to the diagram to show how deoxygenated blood enters the heart;
[Source: CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=606903. Open access.]
To obtain the mark for (a), candidates needed to indicate both the superior and inferior vena cava. The inferior vena cava was often omitted.
Identify the blood vessel labelled X.
[1]
aorta;
Most candidates accurately identified the aorta.
Explain the function of the left ventricle.
[2]
- contracts to generate high pressure / pumps blood at high pressure;
- pump blood (through the aorta) to all parts of the body (apart from the lungs);
- receives blood from the left atrium;
- contraction is stimulated by the AV node;
(c) was answered with marking point b regularly. However, there were some concerning answers such as: "oxygenate the blood". Few mentioned contracting to maintain pressure. Candidates were relatively unsuccessful at earning full marks for this question.
