What potential outcome does exposure to 300 mA of current have for a victim?

Exposure to 300 mA of current can significantly disrupt bodily functions, particularly through its impact on the heart and respiratory system. At this level of current, the heart is highly susceptible to fibrillation, a condition where the heart's electrical signals become disordered, leading to ineffective pumping and cessation of normal blood flow. When the heart stops functioning correctly, it is a critical medical emergency that can lead to respiratory failure as the body is deprived of oxygen.

In addition to the immediate cardiac effects, high levels of current can also interfere with the body’s ability to function overall, which increases the risk of death. Breathing may cease due to paralysis of the respiratory muscles, and without urgent medical intervention, the likelihood of death becomes considerably high.

While muscle contractions, severe burns, and loss of consciousness can occur at various current levels, the distinguishing factor at 300 mA is the high risk of death from stops in breathing and heart failure, making this the most appropriate potential outcome associated with that level of current exposure.