BIOL 2030 Lecture Notes - Lecture 7: Symmetry In Biology, Rhabdite, Monogenea
30 Jan 2017
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Diffuse nervous system: found at base of epidermis and base of gastrodermis (interconnected, bidirectional transmission of impulses, nerve processes synapse or junction with, (neuro) sensory cells, epitheliomuscular cells, nutritive-muscular cells. Important landmark in the evolution of nervous system. Contraction of lateral myofibrils permits peristaltic-type movement. Contraction of longitudinal myofibrils permits body and/or tentacle shortening: tentacles usually have longitudinal muscles. Topic 2: phylum platyhelminthes (flatworms free-living, tapeworms parasitic: introduction, body form and structures, osmoregulation, nervous tissue, parasitic strategies. Monogenea: live i(cid:374) verte(cid:271)rate host (cid:271)ut do have digestive tra(cid:272)t, usually su(cid:272)ki(cid:374)g host"s (cid:271)lood, attach to surface, usually the gill of fish. Cestoda (tapeworms: lack digestive system because all nutrients they obtain is through the skin, reside in the intestines of vertebrates. Introduction: bilateral symmetry, triplobastic acoelomates ectoderm, endoderm, and mesoderm, tissue-organ level of organization. 5- body form and structures free-living worms. Epidermis formed from individual cells that come together: vast majority of worms (in parasitic forms) have a syncytium; multinucleated cytoplasm.
