injection

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injection introduction of a fluid into the body, usually by means of a needle and syringe. The material injected may be a test substance (as in determining allergic sensitivity or immunity to a disease), an anesthetic, a therapeutic drug, a nutrient (in cases where intravenous feeding is necessary), blood, or blood plasma (see blood transfusion ). An intracutaneous injection is the introduction of a small amount of fluid between the skin layers. A subcutaneous injection is directed to the tissues under the skin. When quicker absorption of a drug is required, an intramuscular injection may be used; even more rapid action is obtained by injection into a vein (intravenous). In certain emergencies involving the heart, such as cardiac arrest, an intracardiac injection can penetrate directly into a chamber of the musculature of the heart. Anesthetics are sometimes injected into the spine. In an injection by means of a jet injector gun, fluid penetrates through the skin by means of air pressure and there is no visible puncture mark. Micro-injections can be made into fetuses, even individual cells, with tiny capillary injectors.

in·jec·tion / inˈjekshən/ • n. 1. an instance of injecting or being injected: painkilling injections an injection of capital was needed. ∎  a thing that is injected: a morphine injection. ∎  the action of injecting: sometimes a polio vaccine is given by injection. ∎ short for fuel injection. 2. the entry or placing of a spacecraft or other object into an orbit or trajectory.

injection (one-to-one function) A function with the property that distinct elements in its domain are mapped onto distinct elements in the codomain. Formally, f : X → Y

is an injection if f(x₁) = f(x₂) implies x₁ = x₂

A common use of injections is to map or include elements of some smaller set, such as the set of integers, into a larger set, such as the set of real numbers.

injection (in-jek-shŏn) n. introduction into the body of drugs or other fluids by means of a syringe. Common routes for injection are into the skin (intracutaneous or intradermal); below the skin (subcutaneous); into a muscle (intramuscular), for drugs that are slowly absorbed; and into a vein (intravenous), for drugs to be rapidly absorbed. Enemas are also regarded as injections.

injection In medicine, use of a syringe and needle to introduce drugs or other fluids into the body to diagnose, treat or prevent disease. Most injections are either intravenous (into a vein), intramuscular (into a muscle), or intradermal (into the skin).

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