In mathematics, the term injection refers to an injective function.
In medicine, an injection is a method of putting liquid into the body with a hollow needle and a syringe.
There are generally three types of injections - subcutaneous injections, intramuscular injections and intravenous infusions.
A person with Type I diabetes typically injects insulin subcutaneously. Places on the body where people can inject insulin most easily are:
- The outer area of the upper arm.
- Just above and below the waist, except the area right around the navel (a 2-inch circle).
- The upper area of the buttock, just behind the hip bone.
- The front of the thigh, midway to the outer side, 4 inches below the top of
- the thigh to 4 inches above the knee.