They just shoved a spiky needle in your vein, how come the blood still stays inside your veins after the needle is taken out, is there no hole in the middle of your vein?
In: Biology
Blood vanes and skin are elastic so the needle will push most of it aside and then it closes up after you withdraw the needle. So even a big needle will only leave a small hole. And that hole will quickly get filled up with blood that coagulates sealing it all up. So while there may be a tiny bit of blood loss, for which you do get a band aid, it will quickly close itself in seconds and heal in the matter of hours.
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