Week6LabReport - 2nd ed-1.rtf

2 the pyloric stomach is small and star shaped in

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The pyloric stomach is small and star shaped in which each angle of the stomach is drawn into the corresponding arm; these are branched. These branches are called pyloric caecae or hepatic caecae, or gastric glands in which they work like the pancreas. They also secrete digestive juices and store reserve food. 6. Research and then explain the unique way that the starfish uses its stomach when feeding on bivalves, such as clams. Starfish have a unique digestive system with a mouth at the center of their underside and an anus on their upper surface. A starfish has two stomachs in which the cardiac stomach eats the food outside the starfish's body. When the cardiac stomach comes back into the body, the food in it is transferred to the pyloric stomach. After the tube feet open the shell of its prey, the cardiac stomach is extended into the shell to pull the food inside. Food can be brought into the stomach through the mouth or, in many species, the cardiac stomach can be extended out through the mouth to digest food outside the body. They then use their tube feet to pass the food to the stomach. Starfish use their water vascular system to open the shells of some mollusks and inject their stomachs into the shells, it then digests the mollusk in place. Partially digested food is passed to the inside of the starfish where digestion continues in the pyloric stomach. The sea star's arms are filled with digestive glands called pyloric caeca which help with digestion. These digestive glands secrete enzymes and absorb required vitamins from food. A small intestine runs from the secondary stomach to the anus which is located in the central upper part of the body. ********************************************************************* 3
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  • Fall '15
  • Onefator
  • Digestive System, Phylum Echinodermata

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