BIO 2135 Lecture Notes - Lecture 5: Scyphozoa, Nerve Net, Triploblasty
5 Mar 2016
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Document Summary
Protonatious gates between the cells made of connexon proteins that can change their orientation to each other to open the doors to the two cells and now we can send chemical messages to other cells. Microvillar structures are similar to microvilli structures in choanocytes. Cell to cell adherens that are independent of the opening of the junctions and prevent things from seeping between the cells. Hollow ball of cels that"s a single layer cell - epithelial surface with gap junctions between and sticky junctions holding stuff together. Cells start differentiating and move inwards - so that we have two layers of cells (punching a ball) Endoderm for the digestive epithelium (now we have one outside - ecto, and one inside. The opening is the blastopore (cell mouth) is the first opening to the digestive system. Symmetry can now take place by finding the mouth. Sponges were asymmetric bc no mouth o o.
