| Date | May 2013 | Marks available | 1 | Reference code | 13M.1.HL.TZ1.21 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 1 |
| Command term | Question number | 21 | Adapted from | N/A |
Question
What is the state of the atrio-ventricular and semilunar valves when the left ventricle contracts?
Markscheme
D
Examiners report
Question 21 was also criticised because there is an iso-volumetric phase at the start of ventricular systole when both atrio-ventricular and semilunar valves are closed. However, the examining team felt that during most of ventricular systole the atrio-ventricular valves are closed so one of the four answers was clearly the best.
Syllabus sections
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