A-LEVEL NOTES
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A-LEVEL NOTES

A-LEVEL BIOLOGY AQA NOTES 
control of heart rate


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​Control of the Heart Rate
  • Cardiac muscle is myogenic, meaning it can contract and relax without receiving signals from the nervous system 
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  • The sinoatrial node (SAN) sends out regular waves of electrical activity to the left & right atrial wall causing contraction. The electrical waves are then passed onto the atrioventricular node (AVN), then to the bundle of His, with a slight delay. The bundle of His splits into the Purkynge tissue, causing contraction of the left & right ventricles from the bottom up.
  • The rate at which the SAN fires is controlled unconsciously by the medulla oblongata in the autonomic nervous system

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