what is haemocoel ?

The haemocoel is the main body cavity of invertebrates, such as insects.

Insects do not possess an arrangement of blood vessels such as those in mammals. Instead insects have a cavity that is full of insect blood (known as haemolymph) and the organs of the insect are suspended in this cavity. This means the organs do not have a specific blood supply but are suspended in the blood and receive nutrients as the blood 'washes ' around the organs.

hope this helps u..