Operation Ouch! S04E02 - Can I Borrow Some of Your Blood?

In this episode, the doctors reveal where your blood comes from, Dr Chris meets a patient undergoing life-changing brain surgery and there is a mind-bending trick to test the powers of concentration. There are also more medical mysteries in Ouch and About, and in accident and emergency one patient is in with a double sporting injury, while another has taken a nasty tumble with her horse.