8. Explain how a syringe draws
(a) injectable drug from a bottle.
(b) Blood from a patient's body.​

Explanation:

When we pull the piston from inside to outside a suction is created between the liquid and the piston. This causes the liquid to move upwards and this allows us to draw a drug from a bottle

B A syringe is just a hollow tube with a plunger at one end. After the needle is inserted into the vein (usually), the plunger is moved distally from the needle end, (pull the plunger back), and a negative air space is created that has less pressure that the vein

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