In an emergency, a firefighter may use a ____ extinguisher on scenes where dangerous dogs or other animals are present.

On follow-up, the ED physician informs you that a patient you transported earlier was found to have a hemothorax. You would understand this is a condition in which:

A) the trachea was torn. B) fluid and blood collected around the heart. C) the pleural membranes were punctured by a rib. D) blood collected in the chest.

Which type of research, for example, considers the effect of intraoral sodium bicarbonate rinses on the periodontal ligament of laboratory rats?

A) Case study B) Case control C) Experimental D) Correlational E) None of the above