The Electrical Conduction System of the Heart Simplified

Every healthy heart comes fitted with its very own pacemaker, a cluster of cells called the Sino Atrial Node (SA Node). This natural pacemaker lets of an electric charge intermittently and when it does that initiates a heart beat! If your heart rate is 60bpm you can be sure this little bigger is going off every second! It can be found in the top left of the heart as you look at it (The Right Atrium) -----> When the SA Node fires it initiates a chain of events. Picture one domino, in front of it two dominoes, in front of those 3 dominoes and so on and so forth. The SA Node is pushing over the first 'domino' and the knock on effect causes all the cells to contract in order. The main contraction cells in your heart are all like dominoes lined up next to each other. If you push one then that will star a chain event (Contraction)

Read more:
How the Heart Beats - The Hearts Electrical Conduction System Simplified

Source: The PAD
Image credits: Carl Robinson 

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