it is a thin metal cylinder which is hollow on the inside and sharp on one end, which enables it to pierce your skin or veins and fluid to be pushed through into you.
Needles can also be used to draw out fluid. For example during a blood donation or blood test. Sometimes in science I used needles to break up sticky fluids. The fluid is passed through the needle so I comes out finely from the other end instead of a clump.
it is a thin metal cylinder which is hollow on the inside and sharp on one end, which enables it to pierce your skin or veins and fluid to be pushed through into you.
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Needles can also be used to draw out fluid. For example during a blood donation or blood test. Sometimes in science I used needles to break up sticky fluids. The fluid is passed through the needle so I comes out finely from the other end instead of a clump.
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Needles primary function is (when used withu a syringe) to inject fluid into or extract fluid from the body.
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