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Doing a buttocks injection is simple. You find the spot where the needle of solution needs to go in, insert the needle, and inject the fluid.
Depends on how long the needle is and how big the syringe is. Or, if you're asking about the length of time a subQ injection takes, it only takes a few seconds, less if there's not much to inject.
Yes, it has to be to complete the injection.
3/8
0.75 inch needle at 45 degrees.
Aspirate
Yes it is safe to numb the arm before injection. It is usually done with children when an anaesthetic cream is applied over the skin before injections. For adults it is not always necessary unless the calibre of the needle is big .
Well, a fuel injector isn't a needle, it's a solenoid valve. They are located on the intake manifold.
An "hypodermic injection" or in the US a "shot".
intramuscular
Absolutely ! re-capping the needle prevents accidental injection into another person. Even if the needle is to be disposed of in the 'sharps bin' it should still be capped.