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The original was posted on /r/explainlikeimfive by /u/Rephorm on 2023-06-25 19:52:51+00:00.

Hey there,

If blood travels through veins, and if we need to get a blood test, they put the needle through the vein and take blood.

If medicine is transported via those veins, how do injections work? Like you’re putting the needle through the muscle, not the visible vein, so how does that liquid gets transported through the body?

I hope I’m clear. Sorry for my English.