Final answer:
A shock greater than 75 mA can lead to serious health issues such as muscular contractions and an inability to let go of the electricity source. Higher currents can cause life-threatening conditions like ventricular fibrillation and severe burns.
Step-by-step explanation:
A >75 mA shock has the potential to cause serious health consequences. While very small currents can pass through the body harmlessly, as the current increases beyond the 5 mA safety threshold, it becomes dangerous. Between 10 to 20 mA, the current can induce sustained muscular contractions, leading to situations where the victim is unable to let go of the source of electricity. At currents between 100 and 300 mA, there is a risk of ventricular fibrillation, an irregular and ineffective heart rhythm that can be fatal due to a lack of blood circulation if not promptly treated. At about 300 mA and above, the current may cause burns, particularly if the current is highly concentrated.