Editing Chelicerata (section)

===Body cavities and circulatory systems===
As in all arthropods, the chelicerate body has a very small [[coelom]] restricted to small areas round the reproductive and excretory systems. The main body cavity is a [[hemocoel]] that runs most of the length of the body and through which blood flows, driven by a tubular heart that collects blood from the rear and pumps it forward. Although [[arteries]] direct the blood to specific parts of the body, they have open ends rather than joining directly to [[vein]]s, and chelicerates therefore have open [[circulatory system]]s as is typical for arthropods.<ref name="RuppertFoxBarnes2004ArthropodCirculatory">{{harvnb|Ruppert|Fox|Barnes|2004|pp=527–528}}</ref>