| Date | November 2013 | Marks available | 1 | Reference code | 13N.1.HL.TZ0.23 |
| Level | Higher level | Paper | Paper 1 | Time zone | TZ0 |
| Command term | Question number | 23 | Adapted from | N/A |
Question
What muscle actions cause air to be expelled from the lungs?
A. Internal intercostal muscles relax and diaphragm contracts
B. External intercostal muscles contract and abdominal wall muscles contract
C. External intercostal muscles contract and diaphragm relaxes
D. Internal intercostal muscles contract and abdominal wall muscles contract
Markscheme
D
Examiners report
A discriminating question, testing detailed knowledge of ventilation. D was the correct answer, but a very significant number gave C.
Syllabus sections
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