Question 19N.3.SL.TZ0.18
| Date | November 2019 | Marks available | [Maximum mark: 6] | Reference code | 19N.3.SL.TZ0.18 |
| Level | SL | Paper | 3 | Time zone | TZ0 |
| Command term | Explain, State | Question number | 18 | Adapted from | N/A |
Explain how materials from red blood cells are recycled by the liver.
[4]
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 ✔
State a cause and a consequence of jaundice.
Cause:
Consequence:
[2]
Cause: Do not accept toxins or alcohol
Hepatitis / liver cancer / cirrhosis / parasite infection / excess production of bile pigments/bilirubin / blocked bile ducts / gall stones ✔
Consequence:
yellowing/discoloration of skin/sclera/white of the eye / dark urine / grey feces / brain damage in infants ✔
