What current level is known to cause respiratory paralysis if passed through the body?

The correct answer is that a current level of 30 mA is known to cause respiratory paralysis if it passes through the body. At this level of current, the involuntary muscles that control breathing can be severely affected, which can lead to respiratory arrest. This occurs because the electrical energy interferes with the normal electrical signals that the nervous system sends to the muscles involved in respiration.

Understanding the effects of different current levels on the human body is crucial for safety in environments where electrical hazards may be present. The threshold for causing muscle contractions is significantly lower than levels that could be lethal, making 30 mA particularly notable as it marks a critical point where respiratory function can be compromised.

Current levels above this can lead to more severe injuries or fatalities, but the level of 30 mA is specifically highlighted for its association with respiratory paralysis, making it essential knowledge for safety training and awareness in handling electrical systems.