Arthropods have open circulatory systems. Many of them, also due to their small size, have short open-ended arteries. A common respiratory pigment in crusaceans is hemocyanin.. The system helps supply the whole body and remove waste like carbon dioxide.. Hemolymph goes to the lacunas draining and helps in supplying tissues. Insects do not have respiratory pigments because their blood does not carry any oxygen. Although, all arthropods have a heart!
Horseshoe Crab
This horseshoe crab has a long blood vessel It has eight ostia. These are couples of slit like openings. Valves from these protrude into the heart through the pericardial chamber. The blood is pumped forward and escapes through three pairs of aortae, a pair of arteries around the brain, and another artery located in the front.
Sheet web Spider
A spider's heart, which is also shaped similarly to the horseshoe crab, is located in in the rear of the abdomen. It's protected by the pericardium. The pericardium also contracts the heart to pump the blood through the spider. The blood flows in only one direction, due to certain valves in the heart. A spider can still pump bloood without the brain. While hemoglobin is used to move oxygen through human bodies, a spider uses hemocyanin to complete this task. This protein moves within their blood, rather than being contained within a cell. Both hemoglobin and hemocyanin contain hydrogen, carbon, and nitrogen, but hemoglobin has iron at the core, while hemocyanin has a copper core. The copper, when combined with oxygen, gives the blood a blue color.
Grasshopper
A single blood vessel runs along the side of the insect, from the head to the back edge. In the abdomen, the blood vessel opens up into chambers. These function as a heart. Ostia allow hemolymph to enter the divided sections from the body. The contracting of uscle pumps the hemolymph from one section to the next, moving it forward toward the head. Like an aorta , the vessel simply directs the flow of hemolymph to the head.