chapter 33 learning objectives

chapter 33 learning objectives - Learning Objectives...

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Learning Objectives Chapter 33 Concept 33.1: Sponges are basal animals that lack true tissues From a diagram, identify the parts of a sponge (including the spongocoel, porocyte, epidermis, choanocyte, mesohyl, amoebocyte, osculum, and spicules) and describe the function of each. o Spongocoel- Cavity water goes into after entering the sponge o Porocyte- Water enters the sponge through the pores (donut shaped cells) o Epidermis- Outer layer of the sponge o Choanocytes- Flagellated cells that line the spongocel o Mesohyl - Gelatinous region that separates the two layers of cells in a sponge body o Amoebocyte - Cells that transport nutrients to other cells of the sponge body, producing materials for spicules Can become any type of sponge cell as needed o Osculum - Where the water exits the sponge o Spicules - Skeletal fibers that are produced by amoebocytes Concept 33.2: Cnidarians are an ancient phylum of eumetozoans List the characteristics of the phylum Cnidaria that distinguish it from the other animal phyla o Defining feature of cnidarians Cnidocytes Unique cells that function in defense and the capture of prey Stimulus causes the cell to evert releasing thread Some cnidocytes sting, others just entangle prey Describe the specialized cells that are found in Cnidarians o Cnidocytes Unique cells that function in defense and the capture of prey Describe the two basic body plans in Cnidaria and their role in Cnidarian life cycles o Gastrovascular cavity- a sac with a central digestive compartment In both o Polyps Cylindrical forms that adhere to the substrate by the aboral end of their body Aboral- end opposite the mouth Extend their tentacles, waiting for prey Ex. Hydras, sea anemones o Medusa Flattened, mouth –down version of the polyp **Figure 33.4**
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Moves freely in the water by a combination of passive drifting and contractions of its bell-shaped body Ex. Free-swimming jellies List the four classes of Cnidaria o Hydrozoa o Scyphozoa o Cubozoa o Anthozoa Concept 33.3: Lophotrochozoans, a clade identified by molecular data, have the widest range of animal body forms Distinguish between: o Diploblastic and triploblastic development Dipoblastic- Having two germ layers Triploblastic- Possessing three germ layers Endoderm, mesoderm, and ectoderm o
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