What is the purpose of slings and cravats in first aid?

The use of slings and cravats in first aid primarily revolves around their ability to support injured limbs, particularly arms, and to aid in dressing wounds. A sling is specifically designed to support an arm that may be injured, allowing the body to stabilize and reduce pain while promoting healing. Additionally, cravats, which are versatile pieces of cloth, can be used in various ways to secure dressings in place or support an injured body part.

The other options refer to purposes that are beyond the scope of what slings and cravats are intended for. For example, immobilizing the neck and spine involves different techniques and devices like cervical collars, while controlling abdominal bleeding usually requires direct pressure or specialized dressings rather than conventional slings or cravats. Likewise, providing traction for leg injuries typically involves splints or other devices designed specifically for that purpose. Thus, the role of slings and cravats as supportive aids clearly aligns with the correct answer concerning their use in first aid.