Posterior descending artery is part of the left coronary artery system

The _____ is where you will find directions for making long-distance calls, including international calls

a. employee handbook b. telephone book c. physicians' reference d. medical assisting textbook

Which of the following statements is correct?

A) Vertical angulation is usually described in millimeters. B) Vertical angulation of the tube head and PID begins at 90 degrees. C) To change vertical angulation, the tube head is swiveled from side to side. D) When the open end of the PID is tilted toward the floor, the vertical angle is positive.