ARTHRopoda
Anthropoda all have open blood circulation systems. The circulatory system helps give oxygen to the entire body and disposes the carbon dioxide. Hemolymph and go to the cavities draining and irrigating tissues.
Spiders- Spiders have circulating blood in their bodies. The colourless blood is called hemolymph. Hemolymph transports nutrients, hormones, oxygen and cells. The blood also serves another purpose. It is used to raise the blood pressure during moulting (shedding of old skin) and stretching the legs. Spiders have an open blood circulation system. The blood vessels transport the blood to a specific place but then the blood flows freely in open spaces between the organs. The heart of the spider is located on the back of its abdomen. The heart has it's own nerve centre that allows the heart to beat indepenently. There are connections with the brain that can raise the heart frequency.
Centipedes- A centipedes heart is a long and tubular organ that runs all the way down the back of the centipede. Tracheal tubes surround the heart, allowing oxygen to spread out directly into the blood before it is pumped through the body. The heart pumps hemolymph to the front of the centipede. Centipedes have a hemocoele- blood cavity. The centipedes circulatory system is similar to other anthropods but is less developed. Centipedes possess an open circulatory system in which the heart forces blood through the body cavity to bathe internal tissues with nutrients from the digestive system.
Lobster- The heart of a lobster is a single-chambered sac that is made up of striated muscles with several openings. These openings are called ostia. The heart is suspended in and is surrounded by a blood sinus. The blood sinus is called the pericardium and is located directly above the pyloric stomach on the dorsal surface of the lobster. Invertebrates like these have a dorsally positioned circulatory system and a ventral nerve cord. While vertebrates have a ventrally located circulatory system and a dorsal nervous system. The hemolymph passes from the pericardium, through the ostia, and into the heart. The blood is pushed into the major arteries. Lobsters have an open circulatory system.
Click this link to see a video on anthropoda carciovascular system: http://www.youtube.com/watch?v=KCC_FrbuR3U&list=PL42F2EACF0381F1C2
Spiders- Spiders have circulating blood in their bodies. The colourless blood is called hemolymph. Hemolymph transports nutrients, hormones, oxygen and cells. The blood also serves another purpose. It is used to raise the blood pressure during moulting (shedding of old skin) and stretching the legs. Spiders have an open blood circulation system. The blood vessels transport the blood to a specific place but then the blood flows freely in open spaces between the organs. The heart of the spider is located on the back of its abdomen. The heart has it's own nerve centre that allows the heart to beat indepenently. There are connections with the brain that can raise the heart frequency.
Centipedes- A centipedes heart is a long and tubular organ that runs all the way down the back of the centipede. Tracheal tubes surround the heart, allowing oxygen to spread out directly into the blood before it is pumped through the body. The heart pumps hemolymph to the front of the centipede. Centipedes have a hemocoele- blood cavity. The centipedes circulatory system is similar to other anthropods but is less developed. Centipedes possess an open circulatory system in which the heart forces blood through the body cavity to bathe internal tissues with nutrients from the digestive system.
Lobster- The heart of a lobster is a single-chambered sac that is made up of striated muscles with several openings. These openings are called ostia. The heart is suspended in and is surrounded by a blood sinus. The blood sinus is called the pericardium and is located directly above the pyloric stomach on the dorsal surface of the lobster. Invertebrates like these have a dorsally positioned circulatory system and a ventral nerve cord. While vertebrates have a ventrally located circulatory system and a dorsal nervous system. The hemolymph passes from the pericardium, through the ostia, and into the heart. The blood is pushed into the major arteries. Lobsters have an open circulatory system.
Click this link to see a video on anthropoda carciovascular system: http://www.youtube.com/watch?v=KCC_FrbuR3U&list=PL42F2EACF0381F1C2