You arrive by ambulance at a construction site, where a man is lying on the street. the only information you have is that he fell three stories. his neck is immobilized with sacks of concrete mix on either side. your first action should be to determine:

The first action it's to determine the airway patency.

Explanation:

After falling it is possible that the man has fractured various parts of his body and still survived, but if he is unable to breathe because of blood in his airways he will perish.

Checking if the patient can breathe is one of the most important first actions in helping someone. If the airways are blocked somehow any further effort to save him would be useless. That way we can first check the airways, mobilize his neck and  provide oxygen then move him into the ambulance.

answer; i believe that the correct answer is ; ///(muscle adaptation principe);