Sinus node
Sinus Node
The Sinus Node (pronounced: /ˈsaɪnəs noʊd/), also known as the Sinoatrial Node or SA Node, is a small, specialized mass of cardiac tissue located in the right atrium of the heart. It is responsible for initiating the electrical impulses that regulate the heart's rhythm, making it the natural pacemaker of the heart.
Etymology
The term "Sinus Node" is derived from the Latin word "sinus", meaning "bay" or "curve", and the Latin word "nodus", meaning "knot". This is in reference to its location and function in the heart.
Function
The Sinus Node generates electrical impulses that travel through the heart muscle, causing it to contract and pump blood. This process, known as cardiac conduction, is essential for maintaining a regular and healthy heartbeat.
Related Terms
- Atrioventricular Node (AV Node): Another important part of the heart's electrical system, which receives impulses from the Sinus Node and passes them on to the ventricles.
- Bradycardia: A slower than normal heart rate, often caused by issues with the Sinus Node.
- Tachycardia: A faster than normal heart rate, which can also be caused by problems with the Sinus Node.
- Sick Sinus Syndrome: A group of heart rhythm problems (arrhythmias) in which the heart's natural pacemaker (sinus node) doesn't work properly.
External links
- Medical encyclopedia article on Sinus node
- Wikipedia's article - Sinus node
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