Cold pain receptors will begin to fire when tissue temperature drops below

Which of the following patients has the best means of airway protection?

A) 52-year-old overdose patient being ventilated with a bag-valve mask and oral airway in place B) 41-year-old male stroke patient with an endotracheal tube properly in place but no head-tilt, chin-lift C) 37-year-old male with an altered LOC, a nasal airway in place, and an endotracheal tube in the esophagus D) Unresponsive 75-year-old patient who is receiving the head-tilt, chin-lift, has an oral airway in place, and is receiving positive pressure ventilation

The largest vein of the body is the ___________

A. iliac vein C. portal vein B. renal vein D. vena cava