![]() ![]() Explain how a rise in carbon dioxide may cause an increase in heart rate (4 marks).The impulse is passed down the bundle of His to the Purkinje fibres.The atrioventricular node electrically connects the right atrium and right ventricle./ The atrioventricular node conducts the impulse from the atria down the septum of the heart.The impulse sends a wave of excitation through the atria.The sinoatrial node is the heart’s pacemaker and initiates/starts the heartbeat.Question: Explain the roles of the sinoatrial node and the atrioventricular node in controlled heart rate (4 marks) Impulse eventually reaches the Purkinje fibres, which transmit the impulse to the ventricles causing ventricular systole ![]()
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