Final answer:
The third step in a jaw-thrust maneuver is applying pressure on the jaw. This involves lifting the jaw forward to open the airway, avoiding head tilt. The masseter muscle is responsible for the action of chewing.
Step-by-step explanation:
The question at hand regards the correct order of steps for performing a jaw-thrust maneuver, which is a technique used in emergency situations to open the airway of a patient who may have a spinal injury. While the provided answer choices seem to be unrelated to the jaw-thrust technique, it is important to clarify the correct response for educational purposes.
The third step in performing a jaw-thrust maneuver is actually B. applying pressure on the jaw. This step involves the responder placing their fingers behind the angle of the patient's lower jaw and lifting with both hands to move the jaw forward. It's crucial to avoid tilting or rotating the patient's head if a spinal injury is suspected.
To answer the unrelated question about the masseter muscle, its action is b. chewing. The masseter is a facial muscle that plays a major role in the process of mastication, allowing the jaws to close and crush or grind food.