**Bundle of Kent**
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**Core Concept**
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The bundle of Kent is a group of cardiac fibers that connects the atrioventricular (AV) node to the bundle branches. It is an essential part of the electrical conduction system of the heart, responsible for transmitting the impulse from the AV node to the ventricles.

**Why the Correct Answer is Right**
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The bundle of Kent, also known as the Kent bundle, is a bundle of cardiac fibers that arises from the AV node and descends into the interventricular septum, where it divides into the left and right bundle branches. This specialized group of fibers allows for the coordinated contraction of the ventricles, ensuring efficient pumping of blood from the heart.

**Why Each Wrong Option is Incorrect**
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* **Option A:** This option is incorrect because the bundle of Kent is not a part of the sinoatrial (SA) node, which is the primary pacemaker of the heart.
* **Option B:** This option is incorrect because the bundle of Kent is not a part of the His-Purkinje system, although it is closely related to it.
* **Option C:** This option is incorrect because the bundle of Kent is not a type of arrhythmia, but rather a group of cardiac fibers.

**Clinical Pearl / High-Yield Fact**
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The bundle of Kent can be abnormally developed or interrupted, leading to conditions such as Wolff-Parkinson-White (WPW) syndrome, characterized by an accessory electrical pathway between the atria and ventricles.

**Correct Answer:** C.