BIO 360 Study Guide - Quiz Guide: Amphipoda, Nematode, Organelle
29 May 2017
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Animals distinguished from other kingdoms by: multicellular, eukaryotic cells, lack cell wall, heterotrophs do not produce their own food, motile at some stage, all above sponges have muscle and nervous tissue. Basis for grouping includes: tissues, symmetry, body cavity, segmentation, cephalization (have a head?) A convenient way of surveying marine animals is based on the presence of a vertebral column: invertebrates, vertebrates. Suspension feeders lter food from water. Wide variety of shapes and sizes: shape and size determined by substrate and water currents. Collar cells choanocytes: flagellated, beating creates water current. Pinacocytes: layer of cells that form outer covering. Amoeba-like cells: move within sponge, transport food, repair can form any type of sponge cell. Spicules caco3 or sio2: support body. Sponges have pressure differences: water moving on top > pulls water out. Size limited by ability to circulate water. Evolution folding of body wall allowed increased water ow and larger size.
