Sinoatrial node (SAN) - 'The heart's pacemaker'. It sends a signal which causes a contraction. The contraction forces the blood in the atria down into the ventricles., Atrioventricular node (AVN) - Located in the centre of the heart. It slows down the signal so that the atria contracts first and the ventricles relax ready to be filled with blood., Bundle of His - Specialist heart muscle cells which are transport electrical impulses from the AVN., Purkinje fibres - Placed at the end of the Bundle of His. Thin fibres which allow the ventricle to contract at a paced interval.,

Nervous control of the cardiac cycle

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