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Question 19N.3.SL.TZ0.18a

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Date November 2019 Marks available [Maximum mark: 4] Reference code 19N.3.SL.TZ0.18a
Level SL Paper 3 Time zone TZ0
Command term Explain Question number a Adapted from N/A
a.
[Maximum mark: 4]
19N.3.SL.TZ0.18a
(a)

Explain how materials from red blood cells are recycled by the liver.

[4]

Markscheme

a. erythrocytes/red blood cells have a lifespan of approximately 120 days ✔

b. erythrocytes/red blood cells taken in by phagocytosis ✔

c. «phagocytosis» by Kupffer cells ✔

d. hemoglobin splits into globin and heme groups ✔

e. iron removed / recycled✔

f. heme without iron becomes bile pigment/bilirubin ✔

g. globin/protein digested/hydrolysed to amino acids ✔

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