BIO 2135 Study Guide - Midterm Guide: Seminal Vesicle, Oviduct, Cnidaria
23 May 2016
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Branched digestive system-spread food to body triclad gut. Sperm transfer completes before fertilizing eggs-prevent self fert. Sperm into seminal vesicle of other, egg from ovary through oviduct, sperm released from vesicle. Flatworm eats cnidarian, embeds cnidocytes in epithelium for protection. Ladder nervous system-paired nerve chords on both sides, connected with lateral chords, meet to form cerebal ganglion. Pigment cells curve-eye cup ocelum, pigment part blocks light-auricle-chemosensor. Protonephridia-flame cell with cilia beat water into tube cell out of body, flame cell refills with water from between cells, excrete water when hypertonic. Tegument-surface is one continuous cell-syncytial zone, connected to cells under muscle-unlimited repair to outer layer when attacked by immune system. Egg->free living miracidium comes out when wet, invades snail, mitosis-sporocysts (larval amplification). Sporocysts fills with redia, burts, redia comes out, cercaria comes out of redia, if no sheep host-dormant as metacercaria, sheep injests, moves into intestinal blood vessel to liver. Definitive host-where sperm and egg combine intermediate host-snail.
