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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Which of the following best describes the major role of the medical assistant in draping the patient?
a. To decrease patient anxiety b. To examine selected areas efficiently c. To maintain modesty d. To prevent contamination
Which one of the following statements is true?
A) The ICD-9-CM classifies acquired and congenital conditions to the same category code. B) The ICD-9-CM makes a distinction in the Alphabetic Index between congenital and acquired conditions. C) Congenital conditions can occur during the perinatal period. D) ICD-9-CM assumes in the Alphabetic Index that all conditions are congenital unless otherwise stated.
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Answer the following statement true (T) or false (F)