Which kind of bone cell tears down bone to release calcium and phosphate into the blood?

You respond to a baseball field for a person who was struck by lightning. When you arrive, you see one patient who appears confused and is ambulatory; a second patient who is conscious, sitting on the ground, and holding his arm; and a third patient who is supine and motionless. After requesting additional responders, you should:

A) assess the motionless victim and perform CPR and defibrillation if necessary. B) proceed to the ambulatory patient, sit him down, and assess his mental status. C) treat the conscious patients because the motionless patient is likely deceased. D) assess and begin treating the sitting patient first because he is obviously injured.

Which of the following is false about home O2 therapy?

a. A PRN (as needed) prescription for O2 is acceptable. b. Hypoxemia can be confirmed by arterial blood gas (ABG) or oximetry. c. A PaO2 at or below 55 mm Hg documents need. d. An SaO2 below 88% is clinical evidence of need.