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Date November 2016 Marks available 4 Reference code 16N.3.SL.TZ0.7
Level Standard level Paper Paper 3 Time zone TZ0 / no time zone
Command term Explain Question number 7 Adapted from N/A

Question

The image shows a human eye.

Identify the structures labelled I and II

[1]
a.

Explain how the pupil of the eye can be used to assess brain damage.

[4]
b.

Markscheme

I: conjunctiva/sclera
AND
II: iris/cornea

To award [1] both answers are needed.

 

 

 

 

 

a.

a. bright lights causes the pupil to constrict/iris to increase in size

b. low light causes the pupil to dilate/iris decrease in size

c. these are reflex actions

d. the test for brain damage is to (briefly) shine a bright light in the eyes

e. slow or unresponsive change in pupil size indicates brain damage/concussion

f. different response of each eye indicates brain damage/concussion

 

 

 

 

b.

Examiners report

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

Syllabus sections

Option A: Neurobiology and behaviour » Option A: Neurobiology and behaviour (Core topics) » A.2 The human brain
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Option A: Neurobiology and behaviour » Option A: Neurobiology and behaviour (Core topics)
Option A: Neurobiology and behaviour

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