Question

Why is the blood of Periplaneta called heamolymph? (U)

Answer 1

This is due to the absence of hemoglobin in their blood (the same cell that makes human blood red). ... Cockroaches, like other insects, have an open circulatory system and theirblood is also known as hemolymph (or haemolymph). It flows freely inside the body, touching all the internal organs and tissues.