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.

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