BIO 2135 Study Guide - Final Guide: Pericardium, Radula, Cephalization
20 Apr 2017
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Mantle cavity formed by mantle skirt (double form of mantle that encloses a water space) Ctenidia pump water blood from body and exits through the efferent vessel. Closed circulatiory into the mantle cavity, filter particulate food from the incurrent water stream. system. Radula present but it"s modified bc there is a jaw in the squid. Have a brain encased inside a skull where there is a cns. High degree of cephalization bc there is eyes. Foot is modified to become the 8 arms and. Move backwards (dorsal direction, away from ventral tentacles) Role of cilia system, carries blood in the hemocoel; heart is located in the pericardial cavity. They do have brain tissue, located near the mouth (surrounds the esophagus at anterior end) Moves ventrally as it burrows through sediment. Clam uses cilia to filter food and move it in the currents.
