Which of the following is NOT a concern associated with electric shock?

The correct answer highlights that skin discoloration is not a primary concern directly associated with electric shock. Electric shock primarily affects the body's physiological systems through the nervous and muscular systems. When a person experiences electric shock, they can indeed suffer from loss of muscle control, nerve injuries, and sensations like tingling due to the disruption of normal electrical signals in the body.

Loss of muscle control can occur due to involuntary muscle contractions caused by exposure to electric current. Nerve injuries can result from the electrical current damaging the neural pathways. Tingling sensations are often felt as a result of the shock impacting sensory nerves. In contrast, while skin discoloration may occur in some cases due to other factors (like burns), it is not one of the principal medical concerns that directly arises from electric shock incidents. Therefore, the focus on serious physiological impacts underscores why skin discoloration does not belong in the same category as the other options.