Lab10_Porifera_Nematoda

Lab10_Porifera_Nematoda - lab10 lab11 lab12 lab13 Animals...

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1 lab10 lab11 lab12 lab13 Animals • Eukaryotic, multicellular, ingestive-feeding heterotrophs – Derive their energy from organic molecules made by other organisms – eat plants, seeds, fruits, leaves, other animals, fish, etc. • No cell wall • External or internal skeletons for support • Skin to reduce water loss • Muscles for moving to find food • Brains, nervous system for integration of signals • Internal digestive systems • Invertebrates and vertebrates
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2 Exercise 36 Phylum Porifera - sponges • Sponges are the simplest of the major animal phyla. • Most lives in ocean, a few encrust rocks and wood in freshwater. • Asymmetric bodies without distinct tissues and organs. • Saclike body consists of two layers breached by many pores. – Phylum porifera gets its name from the many pores in the chamber walls. • Internal cavity lines with food-filtering cells – choanocytes. • Intracellular digestion – inside cells. Sponge Grantia • Sessile – attached to the substrate • Filter-feeding heterotrophs and have no photosynthetic pigments – Sometime appear green because symbiotic algae live in their bodies. Grantia ( scypha ) is a tubular, open-ended chamber surround by a thin, porous, folded wall of cells. a. Spongocoel: internal cavity b. Flagellated canal: opening to central spongocoel. c. Incurrent canal: opening to outside a Spongocoel b c External environment
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3 Structure of Sponges • Osculum – large opening water flow out. • Spongocoel – central cavity • Wall of sponge a. Choanocytes (collar cells, lined in flagellated canals) – flagellated cells draw water through pores. b. Epithelial wall c. Spicules – crystalline skeletal structure; in many shapes or fused in an ornate lattice. d. Amoebocyte – creeping mobile cells involving digestion and can differentiate into other cell types as needed. e. Mesenchyme – gelatinous matrix e c d a Choanocytes b Pore Sponge Spongia • Sponges are classified according to the composition of their skeletons and spicules. Calcispongiae and Hyalospongiae have spicules made of calcium carbonate or skeletons composed of silicic acid ( glass sponges because their skeletons have a beautifully delicate, glass-like texture). Demospongiae
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Lab10_Porifera_Nematoda - lab10 lab11 lab12 lab13 Animals...

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