The hypodermic needle reduces contamination for two reasons: First, its surface is extremely smooth, which prevents airborne pathogens from becoming trapped between irregularities on the needle's surface, which would subsequently be transferred into the media (e.g. agar) as contaminants; second, the needle's surface is ...

Syringes can be made from different materials such as plastic, glass, or metal. Plastic syringes are lightweight and disposable, while glass syringes are more durable and can be sterilized for reuse.

Hypodermic syringes are used with hypodermic needles to inject liquid or gases into body tissues, or to remove from the body.