They are embalmed first. So they are pickled and preserved and do not decompose.
Organs in the chest cavity and the abdomen are punctured and drained of gas and fluid contents, before they are filled with formaldehyde.
The blood is removed from one of the veins and replaced by a fluid, usually based on Formalin (a solution of formaldehyde in water), injected into one of the main arteries.
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