Marvellous Valves

Dr Chris and Dr Xand find out why blood rushes to your head when you are upside down but does not rush to your feet when you are standing up! Plus they head to the hospital laundry to see if they are up to the job of laundry workers in Operation Takeover. There are also more medical mysteries to be solved in Ouch and About on Call, and they find out what to do if someone has an asthma attack in First Aid. Meanwhile, in accident and emergency, one patient has a rash all over his body and another needs stitches for a cut lip.