Page "Crustacean" Paragraph 6

The main body cavity is an open circulatory system, where blood is pumped into the haemocoel by a heart located near the dorsum.

Malacostraca have haemocyanin as the oxygen-carrying pigment, while copepods, ostracods, barnacles and branchiopods have haemoglobins.

The alimentary canal consists of a straight tube that often has a gizzard-like " gastric mill " for grinding food and a pair of digestive glands that absorb food ; this structure goes in a spiral format.

Structures that function as kidneys are located near the antennae.

A brain exists in the form of ganglia close to the antennae, and a collection of major ganglia is found below the gut.