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Date November 2018 Marks available 2 Reference code 18N.3.SL.TZ0.16
Level Standard level Paper Paper 3 Time zone TZ0 / no time zone
Command term Discuss Question number 16 Adapted from N/A

Question

The bar chart shows the percentage loss of mass by various organs and tissues of the body of a person due to starvation. The overall body mass loss was 40 %.

Outline how the data indicate that protein was being used as an energy source.

[1]
a.

Outline the reason for such a high percentage reduction in mass of adipose tissue.

[2]
b.

Discuss whether the mass losses shown in the bar chart could be due to anorexia nervosa.

[2]
c.

Markscheme

loss of skeletal/heart muscle «containing protein» ✔

a.

a. adipose tissue has a high energy value ✔

b. adipose tissue may be lost before affecting body metabolism/homeostasis ✔

c. body will use up adipose reserves first before using muscle and organs for energy ✔

Accept fat for adipose tissue

b.

a. loss of mass similar in anorexia and starvation ✔

b. loss could also be due to disease/feeding difficulties/other disorder/poverty/social unrest ✔

c. lack of food intake in anorexia nervosa due to emotional disorder
OR
desire to lose weight/refusal to eat characteristics of anorexia nervosa ✔

d. loss of «cardiac» muscle is characteristics of anorexia nervosa ✔

c.

Examiners report

[N/A]
a.
[N/A]
b.
[N/A]
c.

Syllabus sections

Option D: Human physiology » Option D: Human physiology (Core topics) » D.1 Human nutrition
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Option D: Human physiology » Option D: Human physiology (Core topics)
Option D: Human physiology

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