Author Question: Which of the following opens and closes, usually in one direction, to regulate blood flow through ... (Read 47 times)

sam.t96

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Which of the following opens and closes, usually in one direction, to regulate blood flow through the heart?
 A) valves
  B) arteries
  C) veins
  D) ventricles

Question 2

For the following questions, use an ICD-9-CM code book and select the appropriate code(s) for the diagnostic statements given.
 
  Otogenic pain



chloejackso

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Answer to Question 1

A

Answer to Question 2

388.71



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