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How is a syringe used to take blood from a vein?
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A syringe is a device used to draw or inject fluids into the body. It consists of a hollow tube with an opening at one end and a plunger at the other. The plunger is moved up and down inside the tube, creating suction that draws fluid into the tube or pushes it out. Syringes are commonly used in medicine for drawing blood from veins, as well as injecting medications into the body.