Which type of anesthesia produces a pain-free area?

While ventilating a conscious patient's tracheostomy tube with a connected bag-valve mask, the EMT should verify the patient's comfort level for which of the following?

A) Ventilation rate B) Ventilation volume C) Ventilation pressure D) All of the above

The disadvantage of using the largest size image receptor possible to expose a bitewing radiograph is that:

a. unnecessary structures will be imaged. b. exposure times must be increased. c. anatomical limitations may hinder ideal placement. d. it is contraindicated for patients with periodontal disease.