BIO 2135 Quiz: Echinodermata Keywords
21 Oct 2015
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Ambulacral system: a network of fluid-filled canals that function in gas exchange, feeding, and secondarily in locomotion. This system is derived from both the hydrocoel and axocoel. The system comprises a central ring, the hydrocoel, and radial ambulacra stretching along the body or arms. As well as assisting with the distribution of nutrients through the animal, the system is most obviously expressed in the tube-feet of most echinoderms. Blastopore: the opening to the primitive gut (archenteron) that will develop into either the mouth or anus. Blastopore is a single cell layer that is the first step in animal development. Cardiac stomach: stomach that is closest to the oral opening. The cardiac stomach is the one that gets everted when the starfish feeds. (pyloric stomach is connected to the cecum (digestive glans) that fill the arms). \ Cilia in the stomach move the food from the cardiac stomach to the pyloric stomach.
