Final answer:
The nurse would send the blood bag and tubing to the Blood bank department.
Step-by-step explanation:
The nurse would send the blood bag and tubing to the Blood bank department. The blood bank is responsible for collecting, testing, storing, and distributing blood and blood products for transfusions. They would need to examine the blood bag and tubing to investigate the transfusion reaction and ensure that proper procedures are followed to prevent future occurrences.