Normally, the P-R interval (time from the beginning of P to the middle of QRS) is between ________ seconds (three to five small boxes on the ECG graph paper).

What term describes the pain usually caused by an occlusion of the gallbladder duct?

A) Cholecystitis B) Appendicitis C) Kidney stone D) Pancreatitis

The peak magnitude of the pressure wave experienced by a person:

A) causes secondary and tertiary injuries as a result of the explosion. B) will cause less severe trauma if the person is standing beside a solid object. C) lessens as the person is farther away from the center of the explosion. D) causes more severe trauma if the person is in an open area during the explosion.