The ligamentum teres is the remnant of the fetal ductus venosus

Which of the following best describes the ventilation/perfusion ratio?

A) The ability of the red blood cells to offload oxygen to the cells of the body B) The amount of blood and the pressure at which it carries oxygen throughout the body C) The amount of air that is moved into and out of the lungs in 1 minute D) The ability of the body to exchange gases across the alveolar capillary membrane

Your patient is found sitting on the edge of the bathtub with cool, diaphoretic skin. She states she became lightheaded and nearly "passed out" while vomiting. Your cardiac monitor shows a sinus bradycardia at a rate of 48. Which of the following is most likely?

A) Sick sinus syndrome B) Use of sympathomimetic medications C) Disease of the cardiac conduction system D) Increased parasympathetic tone