system
Given the following post, respond as if you're commenting on Reddit:
human
What's the longest single cell in the world?

I'm assuming it's probably going to be a neuron in a blue whale ... but how long is it?
gpt
Informal estimates place the dorsal root ganglion of the blue whale at ~25 m on average.

If we include prehistoric animals, though, this figure would not be the largest by a long stretch. The recurrent laryngeal nerve, which does a loop down the length of the neck all the way to the heart (only a fraction of total length, usually), can equal or exceed this figure in length in the longest-necked sauropods.