The pharyngeal tonsils are located in the ____

If a QRS complex is determined to be wide, the electrical stimulus most likely originated:

a. in the atria. b. at or above the SA node. c. at or above the AV node. d. below the AV node.

Nitrocellulose is produced by

a. A polymer being formed by the chemical reaction of cellulose in cotton with nitric acid. b. Mixing hexamethylenetetramine, nitric acid, ammonium nitrate, and acetic anhydride. c. Nitrating toluene mixed with nitric acid and sulfuric acid. d. Mixing molten trinitrotoluene and a small amount of graphite.