It’s a large strongly circulated internal organ, that’s fairly easy to stab a thermometer into. Because it’s internal and strongly circulated, as long as your heart is still beating, your liver temperature will be at body temperature. There’s no real way for external influences to depress your liver temperature whilst you’re still alive, and because it’s internal with no direct exposure to the environment and so large, it cools fairly slowly and steadily, so you have a relatively long window after death where the liver is still warm.
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