Re: How do fluids flow in insects?

The resistance to fluid flow in a vessel depends on fluid viscosity, the
dimensions (cross section) of the vessel and the velocity of flow in the
vessel. Insects have a dorsal pulsatile organ, a heart if you will, that
circulates hemolymph. However, there are few vessels in insects- insects
have an open circulatory system and most of the insects hemolymph (insect
blood) is in a cavity containing which bathes the internal organs. So,
there are a few blood vessels in insects and the rate of flow in the legs
and antennae, where there are vessels, is slow so not much pressure is
needed to move the hemolymph.