Which of the following best explains why vasoconstrictors are effective in increasing durations for local anesthesia?
A) Primary action on alpha receptors causes contraction of smooth muscles in blood vessels
B) Primary action on alpha and beta receptors causes contraction of smooth muscles in blood vessels
C) Primary action of beta receptors causes initial contraction of smooth muscles in blood vessels followed by vasodilation of blood vessels
D) Primary action on alpha receptors causes initial vasodilation of the smooth muscle
E)
A
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If several conditions co-exist equally with other diagnoses causing the encounter, the provider:
a. chooses which to list first. b. bills separately for each diagnosis. c. lists the most costly treatment diagnosis first. d. asks the patient to determine which diagnosis is primary.
Which one of these statements is true?
a. The thickest portion of the wedge filter is placed over the densest part of the patient. b. The thickest portion of the wedge filter is placed over the less dense part of the patient. c. The thinnest portion of the wedge filter is placed over the less dense part of the patient. d. A Thoraeus filter is recommended for radiography of very thick body parts..