Which first in Characteristics of first aider?

Are a break in the continuity of a tissue in the body.

It includes self-help and home care if medical assistance is not available or delayed.

In steps in Assessing Emergency Situations, the first thing to do is , "If there is no response", check the airway Open the airway

It is a quick way to find out how to treat any life threating conditions a casualty may have in order of priority.