Question

When a patient receives an injection, fluid passes from a cylinder with a plunger in it, through hey Nero, hollow needle, and into the patient’s arm.

a) The needle starts out empty, the nurse then inserts it into a vile and pulls back the plunger to fill the needle with medicine. As the nurse does this how do the pressure is inside the cylinder and inside the vile of medicine compare to one another?

b) Before the nurse begins pushing the plunger into the cylinder, how do the pressure is inside the cylinder and inside the needle compare to one another?

c) As the nurse squeezes fluid through the needle, how do the pressures inside the cylinder and inside the needle compare to one another?