Immune cells distinguish "self" from "nonself" by recognizing:
A) cellular RNA.
B) major histocompatibility antigens.
C) different types of phospholipids in a cell's membrane.
D) "nonself" enzymes secreted by foreign cells.
Ans: B) major histocompatibility antigens.
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A physician not affiliated with the responding EMS system who takes part in patient care with system paramedics at an emergency scene is called a(n):
A) surrogate medical director. B) volunteer physician. C) intervener physician. D) interloper physician.
A patient taking an ECG shows a regular sawtooth pattern with 30 P waves within a 6-sec inter-val (30 large boxes). What course of treatment should this patient receive for this arrhythmia?
1. Calcium channel blockers 2. Digoxin 3. Cardioversion 4. Defibrillation a. 1, 2, and 3 only b. 2 and 4 only c. 3 only d. 1, 2, 3, and 4
The term bactericidal means:
A) derived from molds B) antibiotic C) systemic D) killing microbes
The patient's blood pressure was 120/80 at rest. During the stress test, it has fallen to 90/50 and he is cold and clammy. What is the appropriate course of action?
A) Stop the test immediately. B) Continue as is. C) Stop for a minute, then resume at a slower pace. D) Slow the pace to let the patient recover, then speed it back up to the previous level.