system
Given the following post, respond as if you're commenting on Reddit:
human
Do tiny insects like crickets and spiders have hearts that beat and pump blood like humans? Also how does their brain interpret the world around them as far as survival goes?
gpt
The thing about insects is that they're built differently than humans. Because they're smaller they don't require closed tubes to deliver blood all over their body. They don't have a heart that looks like a human. Instead they have a small open tube structure that pulses like a heart to help distribute the blood through the body of the insect. So yes they do have a beat but it's not technically not from a heart. 

Also they don't have a brain like humans either. They do have clusters of nerve cells called ganglia. Again they're much smaller than humans and don't have as large of an area to cover. Insects also have less nerves due to their smaller size and so process less information than a human. So their "brain" doesn't need to be as large or organized either.