IB Biology HL 3.1.14 Control of heart rate Question Bank
Practise IB Biology HL 3.1.14 by analysing autonomic control and experimental heart-rate evidence.
- Syllabus
- First assessment 2025
- Course
- Biology HL
- Level
- HL
Exam points
- Compare sympathetic and parasympathetic effects on cardiac rate.
- Interpret exercise, sleep and blood-pH evidence to evaluate heart-rate control.
C3.1.14—Heart rate feedback control question 1
[Maximum number: 6]
Outline how the rate at which the heart beats is controlled.
heart cells can contract on their own / myogenic (muscle contraction);
contractions/heart beat controlled by/starts at pacemaker/sinoatrial node; pacemaker/sinoatrial node is in the wall of the right atrium; signal to contract transmitted from across the atria/heart muscle/heart wall; nerves/impulses from medulla (of brain) to heart; fone nerve increases rate and another nerve decreases it; epinephrine/adrenalin increases rate;
Marking guidance:
[6 max] Reject noradrenalin.
Details of events in the cardiac cycle are not relevant and should not be rewarded
Do not award marks for reference to the autonomic, sympathetic or parasympathetic nervous systems as these are Option E topics.
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