Question 18M.3.SL.TZ1.17
| Date | May 2018 | Marks available | [Maximum mark: 5] | Reference code | 18M.3.SL.TZ1.17 |
| Level | SL | Paper | 3 | Time zone | TZ1 |
| Command term | Compare and contrast, Outline | Question number | 17 | Adapted from | N/A |
The liver receives blood from the digestive system via the hepatic portal vein as shown.
Compare and contrast the composition of the blood in the hepatic portal vein with the composition of the blood in the hepatic vein.
[2]
Compare:
a. both HPV and HV deoxygenated blood
OR
both have high levels of CO2
Contrast:
b. HPV blood richer in nutrients/glucose/amino acids than HV
OR
HV blood lower levels of some toxins
OR
HV blood has higher levels of urea/cholesterol/fatty acids/glycerol/Fe2+
Accept converse.
One comparison and one contrast for two marks.
Outline how the liver recycles the components of red blood cells.
[3]
a. Kupffer cells engulf ruptured red blood cells by phagocytosis
b. hemoglobin is broken down into component molecules
c. some iron (from hemoglobin) transported to bone marrow/stored in liver
d. protein component of hemoglobin converted to amino acids
e. rest of heme component forms bile pigments