Of the following, which is the most serious?

Which of the following would lead to an increase in bone mass?

A) Weight bearing exercise. B) Being bedbound. C) Immobilization in a cast. D) Astronauts in weightless conditions.

The mother of a four-year-old boy states that he fell off the top bunk bed and hit his head. After falling, he appeared to seize for approximately 30 seconds. Presently he has non-purposeful movement to painful stimuli, with a patent airway and slow respirations. His radial pulse is intact, and his skin is warm and dry. You note urinary incontinence. After taking manual inline spinal

stabilization, which one of the following should you do immediately? A) Perform a head-tilt/chin-lift and administer high-concentration oxygen. B) Apply oxygen, fully immobilize the patient, and them initiate rapid transport. C) Insert an oropharyngeal airway and provide high-concentration oxygen. D) Perform a jaw-thrust maneuver and start positive pressure ventilation.