When you donate blood the needle goes into a large, visible vein in your arm or hand but when getting a shot the needle just goes somewhere in your arm.
In: Biology
There are three ways medication is injected. Most things that are a “shot in the arm” are injected into a large muscle. When they pinch your arm they are locating that muscle to make sure they inject in the right part of your arm. These are called intramuscular injections. Some injections are under the skin which are called subcutaneous injections. Then there are IV or intravenous injections/infusions, these would be the ones that look more like when you give blood. For the intravenous injections there is a needle inserted into a large vein and medication is “pushed” into the blood stream for absorption.
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