Drug
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Example:
Imagine trying to adjust the temperature of water in a shower where the hot and cold taps control the flow of water. Just as turning these taps changes the water temperature, a drug acts like these taps by altering the body's functions. In this analogy, the drug is like the tap: by modifying its flow, it affects the overall state of the shower, similar to how drugs influence the biological processes in the body.

Practice Version

Drug: A natural or artificial substance that affects the body's functions. Drug. A drug is a chemical that changes the way your body works.