What is the percentage of oxygen a patient receives when 5.5 liters of oxygen and 3 liters of N2O are delivered per minute?

What are the large, diamond-shaped muscles that cover the back and portions of the neck, whose specific regions can contract independently?

A) Trapezius B) Latissmus dorsi C) Levator scapulae D) Rhomboid

If the ST segment drops 3 mm during exercise, it is evidence of

A) myocardial ischemia. B) old MI. C) ventricular tachycardia. D) J-point elevation.