Following ingestion, a drug crosses a membrane from an area of higher concentration to an area of lower concentration. This is an example of
1. active transport.
2. osmosis.
3. diffusion.
4. metabolism.
Correct Answer: 3
Rationale: Diffusion is the movement of a chemical from an area of higher concentration to an area of lower concentration. Active transport is the movement of a chemical against concentration or gradient. Osmosis involves the movement of water, and metabolism involves chemical conversion. (pp. 37–40)
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