Flexi Says: Like humans, insects have a well developed nervous system and a complete digestive system. However, the circulatory system is of the open type where organs are bathed in hemolymph and there are no blood vessels, unlike humans where it is a closed system made of blood flowing through blood vessels. Insects have trachea for respiration and Malpighian tubules for excretion, whereas humans have lungs for respiration and kidneys for excretion.
