4 amazing facts you never knew about your heart

On 3 May 1968, one person's heart made history when it was used in the UK's very first heart transplant.

The operation was carried out by a team of 18 doctors and nurses at the National Heart Hospital in Marylebone in London.

To mark the occasion, we're taking a look at just how amazing our hearts really are.

Did you know any of these amazing facts before?

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