Electrical control of the heart.

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- The heart is myogenic, this means that is generates its own eletrical impulse. 

- The impulse that it generates is spread throughout the heart and causes it to contract, this is known as the cardiac impulse. 

The spread of the elctrical impulse

1) The impulse starts in the SA node, this is located at the top of the right atrium. This is also called the pacemaker. 

2)The impulse travels through the artria walls.. This causes both artria to contract. This cardiac impulse then reaches the AV node. Also located in the


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