The healthcare provider orders Valium 8 mg IV now. The concentration available is 5 mg/mL. How many mL will the patient receive?

Choice A reason: A transporter shell is not a pharmacological concept; drugs use transport proteins or diffusion. Membrane crossing is key, so this is incorrect for drug movement.

Choice B reason: Selectivity and effectiveness define therapeutic action, not physical movement. Drugs must cross membranes to reach targets, so this is incorrect.

Choice C reason: Drugs must cross cell membranes to move through the body, affecting absorption and distribution. This is a fundamental requirement, making it the correct choice.

Choice D reason: An electric charge may influence solubility but isn’t required for movement. Membrane permeability is essential, so this is incorrect for drug pharmacokinetics.

Choice A reason: pH 7.32 (low, acidic), PaCO2 <37 mm Hg (normal/low), and HCO3- <24 mEq/L (low) indicate metabolic acidosis, as low bicarbonate causes acidosis without respiratory compensation (PaCO2 normal). This matches uncompensated metabolic acidosis, often due to conditions like lactic acidosis or diabetic ketoacidosis, making this the correct choice.

Choice B reason: Uncompensated respiratory acidosis involves elevated PaCO2 (>45 mm Hg) causing low pH, with normal HCO3-. Here, PaCO2 is <37 mm Hg (normal/low) and HCO3- is low, pointing to a metabolic, not respiratory, cause of acidosis, making this choice incorrect for the given ABG values.

Choice C reason: Partially compensated respiratory acidosis requires elevated PaCO2 and increased HCO3- as compensation. Here, PaCO2 is <37 mm Hg (normal/low) and HCO3- is low, ruling out respiratory acidosis. The low pH and low HCO3- indicate a metabolic cause, making this choice incorrect.

Choice D reason: Partially compensated metabolic acidosis involves low pH, low HCO3-, and decreased PaCO2 as respiratory compensation. While HCO3- is low, PaCO2 is not significantly reduced to indicate compensation (given as <37 mm Hg, likely normal). This suggests uncompensated metabolic acidosis, making this choice less accurate than A.