BIO 2135 Lecture Notes - Lecture 4: Obelia, Strobilation, Advantageous

• School: University of Ottawa
• Department: Biology
• Course: BIO 2135
• Professor: Jon Houseman

Document Summary

Gap (septate) junctions: cell to cell communication between the cells that make up the multicellular organisms. Gap and septate junctions differ by whether or not they are found in vertebrate or invertebrates. They have proteinaceous gates between the cells made up of connexin proteins, which can change their orientation to open gate between the two cells. Due to this gates, cells can send chemical signals or messages. There are two steps that occur before going into cnidarian. Oral-aboral axis and symmetry: symmetry of the organisms is determined by the location of the moth, aboral is the oral opening opposite of the oral side. Radial: body part arranged around the oral-aboral axis so that any plane passing though axis result in two identical halves. Biradial: appears radially symmetric but at leasto one set of structure is paired, resulting in only two planes of symmetry that pass through the oral-aboral axis of the organism.