Eli5 how do you keep organs such as heart humid after it is remove from a dead body?

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Hi, after seeing a video of a how we keep a heart beating outside of a body, it has make me wonder. How come the heart look so humid, fresh flesh looking while he his expose to the oxygen that is around it.

Does the video could have been filmed right after it was plugged or is there a natural way that our organs is able to protect their external tissue, or do we put something on top?

And if it is a liquid that we put on top, could that affect the transplant?

Thank you

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