Do tiny insects really have a heart, lungs,brain etc?

Answer 1

Insects have hearts and they have what are more or less brains, lungs are a feature of terrestrial vertebrates. Insects have tiny holes in their exoskeletons that allow air into small chambers where oxygen and carbon dioxide are exchanged across a membrane.

Their circulatory systems aren't closed loops like ours their hearts only serve to push oxygen depleted blood away from their cores. The system relies on pressure imbalances and osmosis to transport blood and dissolved gasses.

Their brains are typically just enlarged nerve bundles in their heads. The bundles are more about sensory processing than anything else. Many insects can survive for a while without their heads, they die of starvation or are eaten by other things but the loss of the primary nerve bundle in their head usually isn't lethal in and of itself. The lack of eyes, antennae and mouth-parts are ultimately what gets them.

Answer 2

Er, well actually, not really. Insects breath by a very different mechanism, that involves diffusion along many long tubes called spiracles that is facilitated by their movement. It's actually extremely efficient and highly evolved. Therefore they don't need lungs. The down side for them is they can't ever be too big b/c there's only so much tissue their spiracles can supply with air.

They do, of course, have brains though (very simple ones).

Answer 3

Yes. They wouldn't be alive if they didn't. They aren't plants.

Answer 4

yes they do, really really really tiny ones :)

Answer 5

Yes, it is amazing but they do.