What can lead to a serious shock if a GFCI is not present?

When considering the potential hazards associated with electric shock in healthcare settings, the absence of a Ground Fault Circuit Interrupter (GFCI) is critical. A GFCI is designed to cut off electrical power in the event of a ground fault, which occurs when electricity flows through an unintended path, such as through a person's body.

Using tools with faulty wiring can lead to an electrical shock because the insulation may be compromised, allowing current to leak. In such cases, if there is no GFCI to detect this leakage, the risk of a shock increases significantly.

Additionally, engaging with live parts accidentally can cause severe shock. This could happen in scenarios where a healthcare worker comes into contact with exposed wires or energized equipment, which could be lethal without the protection that a GFCI provides.

Both of these situations—faulty wiring and accidental contact with live parts—underscore the importance of having proper safeguards in place, such as GFCIs, to help prevent injuries. Therefore, the option combining these two hazards reflects a comprehensive understanding of the risks involved in the absence of a GFCI.