Lecture 4 - Phylum Echinodermata (sea stars, sea urchins,...

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Phylum Echinodermata (sea stars, sea urchins, and sea cucumbers) --Deuterostomes --Blastospore develops into the anus and the mouth develops later --Internal Skeleton --Bilateral as larvae—adults are imperfectly radially symmetrical --Complete digestive system (2 openings) --Have water vascular system (Coelom) --No cephalization --Have a nerve network, but no brain --Neither Open nor Closed Circulatory System --Ampulla w/ Tube Feet --Water comes in through ring canal radial canal ampulla have muscles that contract and water shoots out through the tube foot each tube foot have suckers that can grab on to something muscles in tube foot can contract which can help in locomotion (sea star may use tube feet for food) Phylum Chordata (humans) --Deuterostomes --Notochord --Dorsal, hollow nerve cord --Pharynx (throat) with (gill) slits --Postanal tail Generalized Chordate --Nerve cord in dorsal position --Brain is tubular or hollow --Notochord runs ventral to nerve cord --Cerebral Column starts to develop it grows around notochord
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--Pharyngeal (gill) slits --Cartilage supports the slits --Postanal Tail extends out beyond the anus Phylum Chordata Subphylum Cephalochordata
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This note was uploaded on 04/06/2010 for the course BIO 01-119-10 taught by Professor D'arville during the Fall '09 term at Rutgers.

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Lecture 4 - Phylum Echinodermata (sea stars, sea urchins,...

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