Needles are used to inject medications or other liquids into the body, or to withdraw fluids. Hypodermic needles are hollow needles that can be used to quickly deliver liquids, or to extract substances like blood from a vein. They can also be used to deliver medications that can’t be taken orally, such as insulin, or that could harm the liver. Other types of needles used in medical settings include syringes, lancets, and connection needles.
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