sinoatriaalinen
Sinoatriaalinen refers to the sinoatrial node, often abbreviated as the SA node. This specialized region of cardiac tissue is located in the upper wall of the right atrium of the heart. The SA node is considered the natural pacemaker of the heart. It initiates the electrical impulse that triggers the heart muscle to contract.
The sinoatrial node possesses intrinsic automaticity, meaning it can generate electrical impulses spontaneously without external stimulation.
Following atrial contraction, the impulse reaches the atrioventricular node (AV node), which delays the signal slightly