A type of muscle that forms a ring around a tube, closing off a particular
tube when contracted.

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What are ways that tobacco use can affect familyand socity

22. which situation describes the appropriate use of drugs? a. using your friend’s prescription drug according to label instructions b. using an over-the-counter drug according to your friend’s instructions c. using an over-the-counter drug according to label instructions d. using your friend’s prescription drug according to your friend’s instructions