Insects have open circulatory systems. They don’t have any blood vessels. Their hemolymph just sloshes around in their bodies. They have a heart, but it’s not like yours.

Imagine you are flipped upside down and standing on your head. After a few seconds, you would feel pressure in your head due to an increased blood flow. Humans and other vertebrates are known to have ...

How do insects control the effects of gravity when they climb a tree or hang upside-down waiting for prey? They don't have closed circulatory systems that restrict fluid flow to certain parts of the ...