For the theory on mass media effects, see
Hypodermic needle model A hypodermic needle is a hollow needle commonly used with a
syringe to
inject substances into the body. They may also be used to take liquid samples from the body, for example taking blood from a vein in
venipuncture. A hypodermic needle is used for instant delivery of a drug, or when the injected substance cannot be ingested, either because it would not be absorbed (as with
insulin), or because it would harm the
liver (as with testosterone). There are many possible
routes for an injection.Virtually all current hypodermic needles and their associated
syringes are designed for single use because they are hard to decontaminate and need sharpening after repeat use. Re-using or sharing needles can transmit many
blood-borne diseases including
HIV and
hepatitis C. Needles are normally used only once and disposed of in a
sharps container.
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