BIOL 1412 Lecture Notes - Lecture 16: Enteric Nervous System, Cell Junction, Hydrostatic Skeleton
1 Mar 2016
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Multicellular, heterotrophic (chemo-aka must consume other organisms for both mass and energy purposes), internal digestion, motility, have muscles and nervous system (evolved to coordinate muscles), no cell wall (specialized cell junctions) Closest group to out group is the choanoflagellate, which resembles sponge cells (closest non-animal ancestor: is an opsitonkont, has single posterior flagella, how we got from colonial choanoflagellate to multicellular animal: Cells in an animal are arranged into tissues, the cells adhere in a specific way, which evolved specialization. They have to change shape if cell is moving. Animal body plan components: symmetry, digestive system, may or may not have body cavity (coelom), segmentation, appendages. Types: spherical (only found in protists, animals generally have either, radial. Have single axis that goes through the body. Most have two designs: sac design- Has one opening, serves as both mouth and anus.
