Clips from Operation Ouch! Dr Chris and Dr Xand take a look at how your heart works, and just how powerful it is.
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Clips from Operation Ouch! Dr Chris and Dr Xand take a look at how your heart works, and just how powerful it is.
CBBC is the BBC's multiplatform offering for 6-12 year olds bringing the very best drama, entertainment and factual programmes to its young viewers.
