A patient involved in an altercation has been struck on the side of the head with a baseball bat, in addition to suffering several blows to the arms and legs. When assessing this patient, which of the following signs or symptoms best indicates the patient has suffered a brain injury?

You respond to the vehicle maintenance department, where a middle-aged man is flushing his eyes with tap water. He tells you that acid splashed in his eyes and that they are burning. Which of the following questions is the most important one to ask right away?

a. "What is your past medical history?" b. "Are you wearing contact lenses?" c. "Do you take any medications?" d. "Have you ever had a previous eye injury?"

The study of the way people work is called ________. 

Fill in the blank(s) with the appropriate word(s).