The add-on code used to identify that a patient is younger than 1 year old and is receiving anesthesia is:

A step wedge is a device of layered metal steps of varying thickness used to:

a. determine film freshness. b. determine safety of the safe light. c. evaluate tube head stability. d. test the strength of processing chemicals.

Coronary circulation is the movement of blood:

A. between the heart and lungs. B. throughout the body tissues. C. between the heart and kidneys. D. to and from the heart muscle.