[BIOL 202] - Midterm Exam Guide - Comprehensive Notes for the exam (15 pages long!)
7 Feb 2017
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Lecture 4 sponges, jellyfish, and comb jellies (phyla: porifera, cnidaria, ctenophora) Co(cid:374)e jelly eats (cid:271)ioelu(cid:373)i(cid:374)e(cid:374)(cid:272)es, it(cid:859)s red to (cid:373)ask (cid:449)hat it(cid:859)s eati(cid:374)g, a (cid:272)a(cid:373)ouflagi(cid:374)g (cid:373)e(cid:272)ha(cid:374)is(cid:373)s. Sponges: simples metazoans: parazoans = no tissue, no symmetry, specialized cells (4 types) Ameobocytes: produce structure in the sponge, spicules -> protein base , also reprofution and to move food around. For a large sponge, they need to filter 1 ton of water to get 1 ounce of energy: no body symmetry. At any stage in their development: adults are sessile, jelly fish & corals (phylum cnideria, eumetazoa (with tissue, tissue layers and gut cavity. Blind gut: mount and anus is the same . Q: do all of them have the this: hydrostatic skeleton. Series of muscles that are going all directions (around the ring , By contracting one set, and expanding another it is able to move. Triggers filaments that have toxins in them: nerve net.
