If your patient is able to make an informed decision about medical care, he is considered _______

Which of the following is NOT a possible cause of airway obstruction?

A. relaxation of the tongue B. aspirated vomitus C. shallow breathing D. foreign objects

__________are used in many x-ray examinations to increase or decrease the tissue density.?

A) Gamma rays B) Shields C) Upright Buckys D) Contrast agents