The SA (sinoatrial) node generates an electrical signal that causes the upper heart chambers to contract. The signal then passes through the AV (atrioventricular) node to the lower heart chambers, causing them to contract, or pump.

GLIX-111-508016830

The SA (sinoatrial) node generates an electrical signal that causes the upper heart chambers to contract. The signal then passes through the AV (atrioventricular) node to the lower heart chambers, causing them to contract, or pump.
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The SA (sinoatrial) node generates an electrical signal that causes the upper heart chambers to contract. The signal then passes through the AV (atrioventricular) node to the lower heart chambers, causing them to contract, or pump.

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