Question

before giving additional care, such as applying cold or elevation, to a serious musculoskeletal injury, you must the injured part.

Explanation:

Before providing additional care like applying cold or elevation to a serious musculoskeletal injury, immobilizing the injured part is crucial. Immobilization helps prevent further damage to the tissues, bones, and joints. It reduces pain and the risk of complications such as nerve or blood vessel injury. In musculoskeletal injuries, movement of the injured area can exacerbate the damage. For example, in a fracture, any movement can cause the broken bone ends to shift, potentially leading to more severe soft - tissue damage or even puncturing internal organs.

Answer:

immobilize