Answer:
Defibrillator.
Explanation:
Compressions. Airway. Breathing. Defibrillator.
Muscular strength/endurance would be the term.
Hope this helped.
I think it is uh... 549,196* people, but I may be wrong. I'm using a CDC PDF so, I may have read it wrong.
They must contract and relax to move the bones for movement