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Date November 2017 Marks available 1 Reference code 17N.3.SL.TZ0.18
Level Standard level Paper Paper 3 Time zone TZ0 / no time zone
Command term Identify 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.

[1]
a.i.

Outline the function of the blood vessel labelled B.

[3]
a.ii.

Distinguish between the structure of liver sinusoids and capillaries.

[2]
b.

Markscheme

«hepatic» portal vein

a.i.

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.ii.

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]

b.

Examiners report

[N/A]
a.i.
[N/A]
a.ii.
[N/A]
b.

Syllabus sections

Option D: Human physiology » Option D: Human physiology (Core topics) » D.3 Functions of the liver
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Option D: Human physiology » Option D: Human physiology (Core topics)
Option D: Human physiology

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