What health hazard is posed by electrical current flowing through the body?
It may cause injury by heating body tissue
It may disrupt the electrical functions of cells
It may cause involuntary muscle contractions
All these choices are correct✓Correct answer
Explanation
Current passing through the body causes all three effects: it heats tissue resistively, it interferes with the electrical signalling that nerves and muscles rely on, and it can lock muscles into involuntary contraction so a person cannot let go. That is why the all-of-these answer is correct.