A 56 year old man presents with a spiral fracture of the humerus and wrist drop Which structure is most likely to be damaged?

A patient presents with an arrhythmia and as you are treating them you discuss with a student the depolarisation phase of the cardiac action potential Which change initiates this phase of the action potential?

A 67 year old woman is being treated for haematemesis Within a few minutes of starting transfusion of packed red cells she reports dizziness, breathlessness, tingling of her lips and develops a maculopapular rash What type of hypersensitivity reaction is most likely to be occurring?

A four year old girl presents with a fever Her skin feels warm to touch What is the most likely mechanism of effective thermoregulation?

A father brings his febrile eight week old child to the ED. He tells you that the child's vaccinations are fully up to date. Which of the following vaccines has the child not yet received'?