A teaching model with relative numbers, not real drug effects or doses. Preload is how full the ventricle is before it squeezes; afterload is the pressure it pushes against; contractility is how hard it squeezes.
One tablet a day, in made-up teaching units. The usual range drawn here, about 0.5 to 2 ng/mL, is a common lab reference; heart failure care often aims for the lower part. Hollow dots mark the level just before each dose, which is when real levels are drawn. Not a dosing tool.
Wrong answers are fine here. Each one tells you why.
Your job
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