At approximately 100 milliamps of current, which outcome is associated?

• A. Paralysis of Breathing
• B. Choking
• C. No effect
• D. Heart palpitations

Answer: (A)

When current flows through the body, different tissues respond at different levels. Skeletal muscles, including the diaphragm and the muscles that control breathing, can be driven into sustained contraction or become unable to respond to neural signals as current increases. Around 100 milliamps is enough to overwhelm the respiratory muscles, effectively paralyzing breathing. This means you may be physically unable to take a breath even if you’re conscious and feel the shock, which makes respiratory paralysis the likely outcome at this level. The danger can be greater if the current path is through the chest or if exposure is longer, but the key point here is that about 100 mA can stop the ability to breathe.