Animals
Star fishStar fish are marine invertebrate, and their circulatory system is made up of three different systems: the perivisceral coelom, hemal system, and the water vascular system. The hemal system most resembles a circulatory system, which distributes nutrients that is linked with the excretory system. Hemal channels form rings around the mouth and digestive system. The tube feet on star fish play a big role in circulation by taking in water and then the water vascular system takes oxygen from water and gives carbon dioxide to the tube feet. Its circulatory system also plays a major role in motion by the suction of the tube feet.
|
Sea CucumberSea cucumbers are echinoderms with leathery skin and only have one elongated gonad. They can be found on the ocean floor world wide. It also has a water vascular system filled with coelomic fluid. Its blood vessels are seen as wall spaces and blood vessels in the coelom. The fluid is circulated by these walls contract their muscles to make more space. The circulation applies pressure to their tentacles allowing them to move them.
|
Sea UrchinSea urchins are round, piny echinoderms that feed on mostly algae and are found to be many different colors. Sea urchin also use the combination of a water vascular syatem and a hemal system. The coelomic fluid collects waste and removes it through tube feet. Like other echinoderms, sea urchins do not have a brain and rely on their water vascular system.
|
Echinodermata Basic Info
Echinodermata are sea creatures such as sea urchins, star fish, and sand dollars. This is the largest phylum that doesn't have any fresh water or land representatives. These creatures are found in every ocean through out the world at any depth. They use their tube feet for almost all main bodily functions.