If Cp is negligible, what becomes the driving concentration term in the absorption rate equation?

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Study for the Pharmaceutics Xenobiotics Across Bio Membrane Test. Prepare with flashcards and multiple-choice questions, each providing hints and explanations. Get ready for your pharmacy exam!

Multiple Choice

If Cp is negligible, what becomes the driving concentration term in the absorption rate equation?

Explanation:
In passive absorption, the rate is driven by the concentration gradient across the intestinal wall, essentially the difference between the gut lumen concentration and the plasma concentration. If the plasma concentration (Cp) is negligible, that gradient reduces to the luminal concentration alone, so the driving term becomes Cgi. Cblood or Ctissue would only shape the gradient if the plasma or tissue concentrations were significant; with Cp near zero, they don’t set the driving force for absorption at that moment.

In passive absorption, the rate is driven by the concentration gradient across the intestinal wall, essentially the difference between the gut lumen concentration and the plasma concentration. If the plasma concentration (Cp) is negligible, that gradient reduces to the luminal concentration alone, so the driving term becomes Cgi. Cblood or Ctissue would only shape the gradient if the plasma or tissue concentrations were significant; with Cp near zero, they don’t set the driving force for absorption at that moment.

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