or

The syringe is made up of a plastic piston and barrel. The piston is fitted tightly in the barrel from the open end. The other end that is closed leaving a small tube to pass out is called a nozzle. When the piston or plunger is pulled, the vacuum is created inside the barrel and the air or liquid flows in through the nozzle. And when the piston is pushed in, the liquid or air inside flows out.