A training film made for medical professionals about the different intravenous procedures in hospitals. The film uses a number of different techniques to illustrate the methods of providing fluids and taking blood using live action, graphics and animation. In the opening sequence, William Harvey's work is mentioned with a man walking to camera in slow-motion. The music is rather disconsonant. The nurse first of all prepares the needle pack. The interaction between the nurse and the doctor is dramatised with a patient, Mr Williams; he is reassured before he is cannulated. Certain patients are harder to cannulate than others; children, geriatrics, the obese and a patient who is laying prone. The narrator extolls the virtues of the butterfly needle; this type of needle is shown in cartoon form. The nurse and doctor then cannulate another patient, Miss Birch. An anaesthetised patient is cannulated using a venous catheter; the progress of the needle is shown in the arm via x-ray. Finally, with care the butterfly needle is removed.