APPLIED RADIOLOGICAL ANATOMY

Detailed explanation-1: -Scabs are primarily formed to protect your wound against blood loss and infection. Blood clot cells (platelets) start to clot in order to prevent any more blood or fluids from leaving the body. As the blood on the wound begins to dry it creates the crusty scab layer over the wound.

Detailed explanation-2: -Special blood cells called platelets form a clot at the injury. These cells act like a bandage to stop bleeding and keep out germs and debris. As the clot dries, it forms a scab.