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Dr Chris, Dr Xand and Dr Ronx explore the ins and outs of the human body in a variety of exciting experiments.
The doctors reveal the special fluid which enables your joints to withstand force.
Eyeball Extravaganza! The doctors reveal how your eye muscles work at Mr Grumble's funfair.
The doctors take a dip in the sea to reveal how sensory neurons detect hot and cold.
The doctors reveal how big your lungs would be if they were laid out flat.
Your Heartbeat. The Doctors investigate the amazing piece of body kit that makes your heart beat!
The doctors investigate why we need eyebrows.
The doctors reveal how your brain enables you to learn new things.
The doctors find out why blood rushes to your head when you are upside down.
Dr Chris and Dr Xand reveal how your bones grow to make you taller.
Dr Chris and Dr Xand reveal the type of muscles that help you see... and go for a poo!
Sensational Sphincters. Dr Chris and Dr Xand reveal the type of muscles that help you see... and go for a poo!
Dr Chris makes Dr Xand cry to demonstrate how your body makes different types of tears.
In the last episode of the series, the doctors pick out some of their favourite moments.