Electrocution is dangerous because it can cause various harmful effects on the human body, including stopping the heart. To understand why, we need to consider how the heart functions and how electricity interacts with it.

The human heart relies on electrical signals to maintain a regular rhythm and pump blood throughout the body. These signals originate from a group of cells in the heart called the sinoatrial (SA) node and are conducted through specialized pathways in the heart muscle. The electrical signals cause the heart muscle to contract, pumping blood through the chambers.

Electrocution occurs when an external electrical current passes through the body. This can happen accidentally, for example, by touching a live wire or being struck by lightning. The electrical current can interfere with the heart's natural electrical signals, disrupting its normal rhythm. The heart may start to beat irregularly (arrhythmia) or stop altogether (cardiac arrest). In either case, the heart can no longer pump blood effectively, leading to a lack of oxygen delivery to vital organs, which can cause permanent damage or even death.

Defibrillation, on the other hand, is a controlled medical intervention that uses electrical shock to restore the heart's normal rhythm. When a person suffers from a specific type of life-threatening arrhythmia called ventricular fibrillation, their heart quivers chaotically and is unable to pump blood effectively. Defibrillation delivers a precisely timed, high-energy electrical shock to the heart, which aims to "reset" its electrical activity and allow the natural pacemaker (the SA node) to regain control and restore a normal rhythm.

The key difference between defibrillation and electrocution lies in the context, purpose, and control of the electrical current. In defibrillation, the electrical current is carefully managed and applied with the intention of restoring a normal heart rhythm. Electrocution, however, involves an uncontrolled electrical current that can have unpredictable and harmful effects on the heart and other bodily functions.
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