DP Biology (first assessment 2025)

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Question 23M.2.SL.TZ1.3

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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
3.
[Maximum mark: 4]
23M.2.SL.TZ1.3

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.] 

(a)

Annotate the diagram by adding arrows to show how deoxygenated blood enters the heart.

[1]

Markscheme

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.]

(b)

Identify the blood vessel labelled X.

[1]

Markscheme

aorta;

(c)

Explain the function of the left ventricle.

[2]

Markscheme
  1. contracts to generate high pressure / pumps blood at high pressure;
  2. pump blood (through the aorta) to all parts of the body (apart from the lungs);
  3. receives blood from the left atrium;
  4. contraction is stimulated by the AV node;

Syllabus sections