Taking a blood sample!
1) Tie a band (tourniquet) around the arm to make the vein stand out. This makes it easier to target the needle.
2) Clean the area around the vein with an alcohol-based solution.
3) Push the sterile needle into the vein. The needle is attatched to a sterile syringe. As you pull back the plunger of the syringe, blood is sucked into the syringe.
4) When the necessary volume of blood has been extracted, you remove the needle and hold a little ball of cotton wool over the wound. Apply…