How does doctors syringe work?

A doctor's syringe works by creating a vacuum when the plunger is pulled back, allowing it to draw in liquid or air. When the plunger is pushed forward, the liquid is expelled through the needle, delivering medication or drawing blood. The design ensures precision in dosage, and different sizes and types are available depending on the specific medical needs. Additionally, some syringes are designed for single-use to maintain sterility and prevent infection.