The radial canals carry water to the ampullae and

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canals, located in each arm. The radial canals carry water to the ampullae and provide suction to the tube feet. The water vascular system is a hydraulic system used by echinoderms, such as sea stars for locomotion, food and waste transportation, respiration and excretion. The system is composed of canals connecting numerous tube feet. Sea stars move using a water vascular system and water comes into the system via the madreporite. It is then circulated from the stone canal to the ring canal and into the radial canals. The radial canals carry water to the ampullae and provide suction to the tube feet. 5. Describe the locations of the parts of the digestive system in the starfish. The starfish’s digestive system is composed of the digestive tract and related digestive glands. The mouth is located on the underside of the body. It opens, via a short esophagus, into a cardiac stomach, which then leads into a second, pyloric stomach. Each arm of the starfish also contains two pyloric caeca, long hollow tubes branching outwards from the pyloric stomach. A short intestine runs from the upper surface of the pyloric stomach and opens at the anus in the center of the upper body. Waste is excreted through the anus on the aboral or abactinal side of the body. 1. Mouth: It is present on the oral surface. It shows sphincter muscles. It, is capable of great expansion and reduction. 2. Oesophagus: Mouth leads into short oesophagus. This leads into stomach. 3. Stomach: It shows cardiac and pyloric parts. The first part of the cardiac stomach is big and 5 lobed. It can come out through mouth. This is brought forward by 5 pairs of retractor muscles.
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  • Fall '15
  • Onefator
  • Digestive System, Phylum Echinodermata

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