At what range does the body start to experience heart fibrillation due to electric current?

The correct range at which the body can start to experience heart fibrillation due to electric current is typically between 100-300 mA. At this level of current, the electrical signals that regulate heart contractions can be disrupted, leading to fibrillation, which is a rapid and ineffective heart rhythm. It's crucial to understand that this current level poses a significant risk of serious injury or death due to the potential for cardiac emergencies.

Lower current levels, such as those in the 5-15 mA range, are generally associated with sensations of tingling or muscle contractions, and while they can be very uncomfortable, they are less likely to result in life-threatening arrhythmias. Similarly, currents in the 50-100 mA range can cause muscle contractions and loss of muscle control but are not as directly associated with the onset of heart fibrillation compared to the threshold of 100-300 mA. Current levels exceeding 300 mA are extremely dangerous, often resulting in severe burns or immediate cardiac arrest, but the onset of fibrillation is more reliably observed at the 100-300 mA interval. Thus, this range is a critical threshold for understanding the physiological effects of electric current on the human body.