Which of the following is a jarring injury to the brain?

What is the difference between plasma and serum?

a. Serum comes from anticoagulated blood; plasma does not. b. Plasma contains fibrinogen; serum does not. c. Serum contains fibrinogen; plasma does not. d. Plasma is found only inside the body.

In a patient with post-traumatic stress disorder (PTSD), the EMT would recognize that a patient is reliving an event when he states:

A) "I do not like the smell of diesel fuel because of the airplane crash." B) "I feel so guilty that there was nothing I could do to save them." C) "I notice that my heart rate will sometimes increase for no reason." D) "I cannot sleep well because of nightmares that I am back in the desert."