system
Given the following post, respond as if you're commenting on Reddit:
human
Why can insects survive so long after receiving wounds that would instantly kill a human or other animal?
gpt
You're talking about cases when an insect loses its head and such, aren't you? 

Their nervous system isn't like ours, to begin with.

 The human nervous system consists of two main parts, the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS contains the brain and spinal cord. The PNS consists mainly of nerves, which are long fibers that connect the CNS to every other part of the body. 

That said, our nervous system is very concentrated in one place. Any damage to it can be pretty much fatal or develop some bloody sequels, to say the least. 

That doesn't quite happen to insects. Their nervous system is simple, but much more sectioned. That means it doesn't lose too much when a limb or any other part goes off.

The basic insect nervous system bauplan consists of a series of body segments, each equipped with a pair of connected 
ganglia, with a paired nerve cord connecting adjacent ganglia in each segment. The ganglia are bulbous structures 
consisting of neuron cell-bodies and supporting or glial cells and acts as a local processor or computer. The ganglia are 
interconnected by neurons, constituing a 'computer network'.

That can be cool and all (or creepy), but remember that, even if it survives the loss of it's head, per example, it still needs energy and water. Those are those are satiated from feeding; but if the insect doesn't have it's feeding apparatus anymore, it will eventually die by hunger and complete dehydration.