When looking at an ECG, the QRS is representative of what?
A. Sinus node discharge.
B. Conduction through the AV node.
C. Atrial contraction.
D. Ventricular depolarization.
Answer: D. Ventricular depolarization.
Health Professions
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Which of the following may occur as a result of stimulation of the vagal reflex during a suction procedure?
A. increase in heart rate B. PVCs C. decrease in blood pressure D. first degree heart block
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Match each lettered type of microscope to its clinical use
a. Phase contrast b. Darkfield c. Polarized light d. Fluorescent e. Brightfield 1. _____ Used with fluorochrome dyes to identify lymphocyte subsets 2. _____ Counting platelets manually 3. _____ Routine differentials 4. _____ Viewing spirochetes in microbiology 5. _____ Identifying crystals in synovial fluid
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