why doctors applly injection only on veins
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One reason veins are preferred over arteries for intravascular administration is because the flow will pass through the lungs before passing through the body. Air bubbles can leave the blood through the lungs.
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Explanation:
doctorsdoctors only apply injection on veins because the blood flow in waves is comparatively slower than arteries and before circulating the drugs in all over the body it have to pass through the lungs so that any air bubbles present there will get purified