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H.

Sine and that is to say physics medicine,, or space time, brain, life, the universe.

This week, it weighs only a quarter of a kilogram,

but it moves a weight of blood equivalent to two aircraft carriers over its lifetime.

This miraculous machine is of course your heart and in this hour we're taking a closer look

at how it works and how to keep it healthy.

We'll also be talking to the doctors who prepare

astronauts for orbit and look after fighter pilots and professional athletes. Plus...

And we have the image on the screen here. Oh wow.

That's literally my heart.

I get a glimpse of my own heart in action

and try my hand at some of the techniques

that heart doctors use to unclog blocked arteries.

I'm Chris Smith, he's Tom Crawford and this is The Naked

Scientists and to get in touch with the program as always, Chris at the Naked Scientist.

com or tweet at Naked Scientists. The Naked Scientists Podcast is powered by UKfast.co.uk. The reason we're talking about Hearts is that last week we went along to the British

Cardiovascular Society or BCS Conference in Manchester. It's supported by the British Heart Foundation who are one of the world's largest heart charities

they spend more than a hundred million pounds each year on heart research.

...