How is a syringe used when draining the knees from fluids?

If you have fluid in the knee then you should put a pack of frozen peas on it and then put a hot water bottle on it this is only when you have been to the hospital before you do this or this could...

for putting medicine in patients

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So mice can use it as a waterbed

A syringe is like a needle desgined to work both ways. It is often used to apply liquid medicine. If you put the tip in a liquid and pull back on the part inside the tube, it draws water into it,...