Explanation

Concept: 

First aid is the provision of initial care for an illness or injury.

It is usually performed by a non-expert on a sick or injured person until appropriate medical treatment can be accessed in a hospital

Explanation:

In case the tongue falls backward, blocking the airway, it is necessary to hyperextend the head and pull up the chin, so that the tongue lifts and clears the airway.

Place one hand on the person's forehead, gently till their head back, and elevate the tip of their chin with 2 fingers to open the airway.

As a result, the tongue is pushed back toward the neck.

Avoid pressing on the mouth's floor as doing so will cause the tongue to rise and restrict the airway.