| Date | May 2013 | Marks available | 1 | Reference code | 13M.1.HL.TZ2.20 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 2 |
| Command term | Question number | 20 | Adapted from | N/A |
Question
What causes the rate of heart contraction to increase or decrease?
A. The heart muscle itself
B. Nerve impulses from the brain
C. A hormone from the thyroid gland
D. The rate of return of blood to the left atrium
Markscheme
B
Examiners report
Three teachers expressed concern over this question. A number chose answer A, suggesting that these students do not understand the concept of the myogenic origin of the heart beat.The role of adrenaline is required, so students should have been able to rule out response C.
Syllabus sections
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