page_title: Sinoatrial node
hierarchical_section_title: Sinoatrial node
caption_attribution_description: Heart; conduction system
context_page_description: The sinoatrial node is a group of cells located in the wall of the right atrium of the heart. These cells have the ability to spontaneously produce an electrical impulse, that travels through the heart via the electrical conduction system causing it to contract. In a healthy heart, the SA node continuously produces action potential, setting the rhythm of the heart and so is known as the heart's natural pacemaker. The rate of action potential production is influenced by nerves that supply it.
context_section_description: The sinoatrial node (also known as the SA node or the sinus node) is a group of cells located in the wall of the right atrium of the heart.  These cells have the ability to spontaneously produce an electrical impulse (action potential; see below for more details), that travels through the heart via the electrical conduction system (see figure 1) causing it to contract. In a healthy heart, the SA node continuously produces action potential, setting the rhythm of the heart and so is known as the heart's natural pacemaker. The rate of action potential production (and therefore the heart rate) is influenced by nerves that supply it.
caption: Figure 1 shows the conduction system of the heart. The SA node is labelled 1.
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