BIO 2135 Study Guide - Midterm Guide: Coelom, Trochophore, Glucosamine
23 May 2016
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Annelids-trochophorate autapomorphies-metamerism of mesoderm structures-repeating segments, 4 bundles of setae-bristles for gripping, made of beta chitin. Chitin-n acetyl glucosamine, n acetyl branches alternate sides-polar. Parallel strands in sheet, h bond to each other. Circular muscle out, long muscle in-each segment is hydrostatic. Anchor end segment, change shape of others to move forwards. Coelomic fluid independent in each segment, cannot be used as circulatory. Dorsal vessel from back to front, ventral from front to back, each segment has lateral vessels through digestive and metanephridia. Picks up nutrients and o2 on the way up. 5 aortic arches-reverse blood flow to dorsal to ventral-divert nutrients to reproductive system. Chloragogen tissue-in digestive system, deaminates nutrients, nitro waste to metanephridia, surrounds aortic arches. No nutrition obtained until intestine, need circ system to send nutrients to front segments. Calciferous glands-ca dissolved by acid in digestive sys, remove ca from rocks eaten. Release coelomic fluid from metanephridia to moisten skin.
