| Date | May 2012 | Marks available | 1 | Reference code | 12M.1.HL.TZ2.22 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 2 |
| Command term | State | Question number | 22 | Adapted from | N/A |
Question
The diagram shows the ventilation system in humans.
What is the function of the structure labelled X?
A. Protect the lungs
B. Contract to cause inhalation
C. Become flatter to move the ribcage up
D. Relax in order to increase the thoracic capacity
Markscheme
B
Examiners report
N/A
Syllabus sections
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