Normal sinus rhythm is characterized by all of the following, EXCEPT:
A) minimal variation between the R-R intervals.
B) QRS complexes that are less than 140 milliseconds.
C) consistent PR intervals and upright P waves.
D) a consistent heart rate between 60 and 100 beats/min.
Answer: B) QRS complexes that are less than 140 milliseconds.
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The region that is described as the switchboard to the brain is made up of what structure(s)?
A) Biopsychosocial ellipses B) Maxillofacial sinus C) Thalamus D) Neurotransmitters
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The emission and movement of electromagnetic or particulate energy through space is known as:
a. ionization. b. radiation. c. radioactivity. d. the formation of ion pairs.
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