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 ...

The body position of the American grasshopper strongly affects its physiological responses, according to a study. In vertebrates, the circulatory system rapidly responds to changes in body position to ...

If you jump out of bed too quickly, you might feel a bit light-headed. That's because when you're lying down, gravity causes your blood to pool in the lower parts of your body rather than in your ...