BIO 1130 Lecture Notes - Lecture 16: Symmetry In Biology, Choanocyte, Pinacoderm

• School: University of Ottawa
• Department: Biology
• Course: BIO 1130
• Professor: Jon Houseman

Document Summary

Tissues none, diploblastic, or triploblastic (has mesoderms) Symmetry and cephalization asymmetry, radial, and bilateral symmetry. Uses of choanocytes in an aquiferous system (water pumping system) Cells but no tissues ( no junctions) Totipotenent cells (any cell can turn itself into a stem cell) Flagellum are beating bring water up the sponge. Choanocyte traps good in the microvilli and consuming by phagocytosis. Pinacoderm (layer) forms outer margarine of the organism. Spicules to give shape they are produced by schlerocyte. Archeocyte (sponge stem cells form egg) another word for amoebocyte. Animal innovations (symplesiomorphies: gap (septate) junctions loss of the choanocyte, true tissues with all components internall digestive epithelium oral-aboral axis and symmetry. Gap junctions: space to allow communications of other cells. Connexon open and close the channel to determine what cell communicates with each other. Blastula a hallow ball for growing, they invaginate to get an endoderm (for the lining also known as the gut) Radial symmetry sense in 360 degrees.