Physical Education A-Level
Sinoatrial node as the pacemaker
What Sinoatrial node as the pacemaker means in Physical Education A-Level, as defined for AQA.
Definition of Sinoatrial node as the pacemaker
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Reference: AQA
Sympathetic stimulation releases noradrenaline at the sinoatrial node, raising the rate at which it fires, while parasympathetic stimulation releases acetylcholine there, slowing its firing rate.
Topics that use Sinoatrial node as the pacemaker
- Cardiovascular system (AQA A-Level)
Related terms
- Affinity for oxygen
- Antagonistic action of the two divisions
- Anticipatory rise
- Autonomic control of heart rate
- Baroreceptors
- Bohr shift during exercise
- Cardiac output
- Cardiac output and oxygen uptake
Using Sinoatrial node as the pacemaker in the exam
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