Syringes and needles are sterile devices used to inject solutions into or withdraw secretions from the body. A syringe is a calibrated glass or plastic cylinder with a plunger at one and an opening that attaches to a needle. The needle is a hollow metal tube with a pointed tip.
A syringe and needle assembly is used to administer drugs when a small amount of fluid is to be injected; when a person cannot take the drug by mouth; or when the drug would be destroyed by digestive secretions. A syringe and needle may also be used to withdraw various types of body fluids, most commonly tissue fluid from swollen joints or blood from veins.

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