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
Those that are given into a muscle are not supposed to go in a vein. Quite the opposite actually – if it gets into a vein, it can cause a huge amount of damage.
The way you can know whether the needle is or isn’t in a vein is simple – you just aspire (pull the piston of the syringe). If some blood appears inside the syringe, then the needle is inside a vein.
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