The operator asks you to prepare a material to line the base of a particularly deep cavity preparation. The best choice of material would be

At an industrial complex, a young male was struck in the head by a large piece of steel thrown from a grinding machine. Assessment reveals a soft, painful depression underlying a tear in his scalp, which is covered with dried blood. There is also clear fluid coming from his right ear. He is conscious but confused and exhibits the following vital signs: pulse 84, respirations 16, blood pressure

142/76, and SpO2 92%. Emergency Medical Responders are on scene and are maintaining in-line manual stabilization of the cervical spine. What instruction would indicate the next step needed in this patient's care? A) "Let's pack his right ear with gauze to stop the loss of fluid." B) "Place manual, direct pressure over the injury to control bleeding." C) "I need someone to check the clear fluid for glucose." D) "Will someone administer supplemental oxygen to the patient?

Define the medical terms listed below: hemithorax—