| Date | May 2009 | Marks available | 1 | Reference code | 09M.1.HL.TZ2.14 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 2 |
| Command term | Question number | 14 | Adapted from | N/A |
Question
Which muscle action is associated with an increase in the volume of the thoracic cavity when breathing in?
A. The diaphragm contracts.
B. The external intercostal muscles relax.
C. The internal intercostal muscles contract.
D. The abdominal muscles contract.
Markscheme
A
Examiners report
This question had a high discrimination index. Good candidates realized the function of the diaphragm in breathing in.
Syllabus sections
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