BIOL 117 Lecture 13: Chapter 13 - Animal Diversity
23 Jul 2016
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May have extra cellular matrix: outside cell, may be uid, gelatinous (cartilage, chondrioblasts), bone (osteoblasts), plasma (oozes clear uid on skin) No alternation of generations (all either haploid or diploid, unlike plants which can switch back and forth) Germ layer: all cells created to serve function: animals without germ layer: can be separated and reassemble itself. ex sponge ~ can pulverize it and go back later, will be sponge again. Water goes in through pores and ows back out. Sponge cells aren"t exactly specialized so they can rearrange themselves after being destroyed. Spictuals in sea sponge: diploblastic animals: two germ layers (endoderm - linings and ectoderm - skin, outside things). Associated with digestion lining (ectoderm: triploblastic: three germ layers (endoderm; mesoderm - middle ~ lungs, heart, kidneys; ectoderm) Symmetry: equal halves: radial symmetrical: multiple planes in organism (ex. Jelly sh: bilateral symmetry: plane can only create two equal halves. Body cavity (coelom): only triploblastic, (don"t think digestive).
