Question

how does a doctors syringe filled with medicine from a medicine bottle

Answer 1

Answer:

by making a hole in the medicine bottle cap with the needle

Answer 2

Answer:

The needle is actually a pipe with very small diameter. Now,when we pull the piston slowly,the liquid medicine is being filled in the hollow space of the syringe. This happens because when we pull out the piston the hollow space wants to regain the air which was expelled during the pushing process.