| Date | November 2011 | Marks available | 1 | Reference code | 11N.1.HL.TZ0.29 |
| Level | Higher level | Paper | Paper 1 | Time zone | TZ0 |
| Command term | Question number | 29 | Adapted from | N/A |
Question
What occurs during the process of ventilation?
A. Contraction of external intercostal muscles raises the ribcage.
B. Relaxation of the abdominal muscles decreases the air volume in the lungs.
C. Contraction of internal intercostal muscles raises the ribcage.
D. Relaxation of the diaphragm decreases the air pressure in the lungs.
Markscheme
A
Examiners report
N/A
Syllabus sections
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