Action of the heart 0.0 / 5 ? BiologyHuman, animal and plant physiologyASEdexcel Created by: Elisabeth MontagueCreated on: 21-03-19 19:41 What tissue produces the wave of excitation? Sinoatrial node 1 of 13 Where is the SAN? In the right atrium 2 of 13 The wave of excitation from the SAN causes what? The atria walls to contract 3 of 13 Where are the annulus fibres? Between the ventricle and the atrium 4 of 13 What are annulus fibres non-conducting for? To prevent excitation passing directly from atria to ventrilces 5 of 13 What is the conducting tissue between the atrium and the ventricle? Atrioventricular node 6 of 13 What occurs between the AVN passing on the wave of depolarisation to the bundle of his? A slight delay of 0.1s 7 of 13 Where is the bundle of His? Septum 8 of 13 What is the function of the bundle of His? Ensures atria have stopped contracting before the ventricles start 9 of 13 When the bundle of His divides into 2, where does it carry the wave of excitation? Into the Purkyne tissue 10 of 13 What is purkyne tissue made from? Conducting fibres 11 of 13 Where does the purkyne tissue penetrate? The septum and the ventricle walls 12 of 13 What happens as the wave travels through the purkyne tissue? Ventricle walls contract from the apex up, squeezing blood out of the heart 13 of 13
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