injection

injection

[in-jek-shuhn]
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.
Injection may refer to:

  • Injection (medicine), a method of putting liquid into the body with a syringe and a hollow needle that punctures the skin.
  • Injective function in mathematics, a function which associates distinct arguments to distinct values
  • Injection molding, a manufacturing technique for making parts from thermoplastic and thermosetting material
  • Injection (economics), a financial boost entered into the economic cycle, includes government spending, investment and exports
  • Injected (band), an American rock band from Atlanta, Georgia formed in 1995
  • Code injection, a technique in computer science for exploiting vulnerabilities in computer programs due to erroneous assumption by designers.
  • Dependency injection, a programming design pattern and architectural model, sometimes also referred to as inversion of control
  • Fuel injection, a means of metering fuel into an internal combustion engine
  • SQL injection, a security vulnerability that occurs in the database layer of an application

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