Which of the following refers to the investigative technique used to determine the cause of disease using controlled experiments?

You respond to the scene of an assault, where a 20-year-old man was struck in the chest with a steel pipe. Your assessment reveals that the patient is unresponsive, apneic, and pulseless. The MOST appropriate next intervention is to:

A) perform 5 cycles of well-coordinated CPR. B) look for evidence of a pericardial tamponade. C) immediately assess the patient's cardiac rhythm. D) give 2 minutes of 15 compressions and 2 breaths.

Progressive muscle weakness, often accompanied by hearing loss, diabetes mellitus, heart problems, nervous system disorders, and other biochemical abnormalities are signs and symptoms of which disease?

A) Mitochondrial myopathy B) Fibromyalgia syndrome C) Myasthenia gravis D) Duchenne muscular dystrophy