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Controls movement of blood in and out of the heart. The heart will beat faster but the rate of blood volume entering and exiting The heart will be the same.

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During exercise, the need to transport more oxygen to the working muscles means the heart has to work harder. This means that more blood is pumped around the body and faster. Measurements such as stroke volume, heart rate and cardiac output all have to change as a result.

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During exercise, the Sinoatrial node sends more signals to other areas of the heart resulting in it to contract more. 

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During exercise, the Sinoatrial node sends more signals to other areas of the heart resulting in it to contract more. 

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During exercise, the heart must contract more to meet the demand for oxygen and the Sinoatrial node will increase the overall pace of the heart.

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The fibre bundles extends from the AV node and travels down the septum

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as you can see by the diagram it is located in the bottom left hand corner

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The AV node serves as an electrical relay station, slowing the electrical current sent by the sinoatrial (SA) node before the signal is permitted to pass down through to the ventricles.

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It is located in the right atrium of the heart in the myocardium. 

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It is located in the right atrium of the heart in the myocardium. 

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The Sinoatrial node is the natural pacemaker of the heart.  

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The Sinoatrial node is the natural pacemaker of the heart.  

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It sends an electrical impulse that travels down the heart through each cell until it reaches the Atrioventricular node. This signal causes the start of the beating process for the heart.

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It is an important part of the electrical conduction system of the heart. This is because it transmits impulses from the atrioventricular node to the ventricles in the heart.

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The atrioventricular node is found on the right side of the partition between the two atria, near the bottom of the right atrium.