BIO 2135 Study Guide - Midterm Guide: Ink Sac, Gastropoda, Cephalization
23 May 2016
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Mollus-trochphore, radula, mantle to secrete ca shell, muscular foot w cilia, retractor muscle-hid in shell, tetraneural nervous system. Larva-band of cilia, tufts at top and bottom. Metanephridia-nitrogenous waste diffuses into coelomic fluid, funnel with nephridiopore outside, funnel opening=nephrostome takes in fluid, tubule use active transport-materials recovered from filtrate. Radula teeth matches food type-sharp for predators, flat for algae eating. Food scraped off by radula can wash away-secretes mucus to trap food. Retractor muscles from shell to foot-pull shell down to hide. One pair in visceral, one pair in foot, brain is a ring around esoph. Ctenidia-covered with cilia, pump water over gills, can keep breathing when shell pulled down. Anus/metanephridia in the flow of water, washed out. No capillaries, blood flows in hemocoel cavity, washes over organs, vein collects blood from hemocoel with suction to ctenidium, back to heart. Gonads on wall of metanephredia ducts, releases gametes. Anus and metanephridium to mantle cavity in excurrent-wash away waste and gametes.
