BIOL165 Study Guide - Water Vascular System, Symmetry In Biology, Gastrovascular Cavity
18 Jun 2013
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Beat of flagella starts at top of the band and moves down toward the base, reverse. Sexual choanocytes transform into sponge/eggs & eggs sometimes from archeocytes/asexua l reproduction by budding. Has: nerve net, sensory organs, stinging nematocysts, simple muscular system, gastrodermis layer+epidermis layer, gastrovascular cavity+extensible tentatcles. Stinging nematocysts can cause nasty welts & great pain. Movement is rhythmical with bell opening and closing through compression. Flowering animal direction allows for the organism to move backwards of limited movement. Feed through h2o move through body with choanocytes. Archeocytes- amoeboid cells that move about gelatinous matrix&differentiat e into different cells types. Starfish, brittlestars, sea urchins, sand dollars, sea cucumbers. Lampreys, lancelets, urochordates, cartilagionous and bony fish, amphibian, reptiles, dinosaur, birds and mammals. Nearly always separate sexes, each sex w/ paired gonads and ducts leading to cloaca or. Endoskeleton of dermal calcareous ossicles w/ spines or spicules in dermis. Digestive system is usually complete, axial of coiled.
