The whole arm is full of veins and pumping with blood, why can’t they just inject it anywhere or move downwards, down the arm? Why do they HAVE to inject it in the beginning of the bicep/beginning of arm area?
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The reason that healthcare professionals need to inject the needle directly into the vein is because veins are the blood vessels that carry blood back to the heart. When a needle is injected into a vein, it allows the medication or other substance to be directly transported into the bloodstream. If the needle was injected into an area outside of the vein, the medication would not be able to reach the bloodstream as efficiently. Additionally, injecting a needle into a vein is generally less painful than injecting it into other tissues.
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