In which situation is it appropriate to use a tourniquet?

Using a tourniquet is appropriate in situations of severe bleeding from a limb. A tourniquet is a device designed to apply pressure to a limb or extremity to stop severe blood loss. When a person experiences a traumatic injury that results in uncontrolled bleeding, particularly from an arm or a leg, applying a tourniquet can help save their life by preventing excessive blood loss.

In situations with minor cuts and scrapes, the application of a tourniquet is unnecessary and could cause more harm than good. Head injuries typically require specific medical interventions that do not involve tourniquets, and abdominal injuries may also necessitate different approaches to manage bleeding or internal damage. Thus, the use of a tourniquet is specifically indicated for severe limb bleeding, making it the correct choice in this context.