DP Biology (last assessment 2024)

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Question 18M.3.HL.TZ1.20

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Date May 2018 Marks available [Maximum mark: 7] Reference code 18M.3.HL.TZ1.20
Level HL Paper 3 Time zone TZ1
Command term Explain, Label, Outline Question number 20 Adapted from N/A
20.
[Maximum mark: 7]
18M.3.HL.TZ1.20
(a.i)

The diagram shows the liver and its main blood vessels.

[Source: VectorStock]

 

Label the hepatic portal vein bringing blood to the liver.

[1]

Markscheme

[Source: VectorStock]

 

Accept the vessel labeled (hepatic portal vein) as it ends in the liver and does not continue. A label anywhere on the vessel or pointing to the arrow underneath it is acceptable.

(a.ii)

Outline the circulation of blood through liver tissue.

[3]

Markscheme

a. hepatic artery carries oxygenated blood (from the aorta) 

b. hepatic portal vein carries (deoxygenated) blood from digestive tract 

c. blood from hepatic portal vein and hepatic artery mixes 

d. flows through sinusoids 

e. hepatic vein carries blood away from liver/to heart

(b)

Explain the breakdown of hemoglobin in the liver.

[3]

Markscheme

a. hemoglobin absorbed by phagocytes/Kupffer cells 

b. split into heme and globin 

c. globin hydrolysed/broken down to amino acids 

d. iron removed from heme group / heme broken down to form bilirubin/bile pigment

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