How do insects, like flies, have such quick reaction times?

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How do insects, like flies, have such quick reaction times?

In: Biology
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Dont have much to give but if I remember correctly for flys it has something to do with their eyes

Reactions are delayed as a signal travels through the nervous system. Brains are big and complex and so the signal has to travel quite far. I’d estimate maybe ten feet of neurons in a human – this is really just a guess based on some numbers I remember from bio class tho. Flies have much less brain to bog down such operations – not to mention the nerves from the brain to the parts of the body are a thousandth of the length of similar human nerves. They react much faster, but do a lot less thinking.