Bioavailability is:
  1. A measurement of how much and how quickly a drug reaches the epidermis
  2. A measurement of how much and how quickly a drug reaches the circulatory system
  3. A measurement of how much and how quickly a drug builds-up in the liver
  4. A measurement of how much drug stays in the bloodstream after 30 days
Explanation
Answer: B - Bioavailability is a measurement of how much and how quickly a drug reaches the circulatory system. Bioavailability is influenced by administration route, gastrointestinal absorption mechanisms, solubility, and drug chemistry.
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