: After we die, do our immune system and every cell inside our body die alongwith us or do they just stay there roaming inside us until we get decomposed?
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Most of the cells in your body require oxygen delivery from your heart, so once your heart stops beating they won’t last long.
There are, however, lots of bacteria in your digestive system. They’re not technically human, but they do make up part of your body, and those can survive for a very long time after you’ve died.
Some are very energy hungry like your brain and heart and die within minutes.
Others have less demand and more food storage and can persist for hours, or even longer if it’s cold.
Once your heart stops all the oxygen and nutrition supply to the other cells stops too so they can only live off whatever they’ve kept stored.
Most of your cells don’t store much and have no way to get more, and so can’t survive on their own for very long.
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