| Date | November 2017 | Marks available | 2 | Reference code | 17N.3.SL.TZ0.18 |
| Level | Standard level | Paper | Paper 3 | Time zone | TZ0 |
| Command term | Distinguish | Question number | 18 | Adapted from | N/A |
Question
The diagram shows the liver. The arrows show the direction of blood flow into and out of the liver.
[Source: © International Baccalaureate Organization 2017]
Identify the blood vessel labelled B.
Outline the function of the blood vessel labelled B.
Distinguish between the structure of liver sinusoids and capillaries.
Markscheme
«hepatic» portal vein
a. takes blood from intestine/spleen/pancreas/stomach to liver
b. carries digested food/nutrients/glucose
c. prevents glucose entering the general circulation
d. helps maintain osmotic potential of blood
e. allows toxins to be removed
[Max 3 Marks]
a. sinusoids have open pores/fenestrations/discontinuous endothelium and capillary endothelium is continuous/does not contain fenestrations
b. Kupffer cells are located inside sinusoids but not in capillaries
c. sinusoids larger in diameter than capillaries
Accept labelled diagrams
[Max 2 Marks]
