Bio_1A_Lecture_14_Tissues

Bio_1A_Lecture_14_Tissues - BIOLOGY 1A BIOLOGY 3rd section...

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BIOLOGY 1A BIOLOGY 1A - - 3rd section. 3rd section. Fall 2007 Welcome to the Animal Kingdom Welcome to the Animal Kingdom Animal Diversity, Form and Function Animal Diversity, Form and Function
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eukaryotic: eukaryotic: Cells with true nuclei. Membrane- enclosed nuclei & membrane-enclosed organelles. multicellular multicellular : : Composed of many cells heterotrophic: heterotrophic: Must take in organic molecules for nutrition. Typically store CH 2 O as glycogen. special structural features: special structural features: Lack cell walls. Unique intercellular junctions. Possess tissues for impulse conduction & locomotion . What is an animal? What is an animal?
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Early embryonic development in animals Zygote Eight-cell stage Blastula Cross section of blastula Gastrula Gastrulation Endoderm Ectoderm Cleavage The origin of animals - an Hypothesis The origin of animals - an Hypothesis MULTICELLULARITY: Eukaryotic Diversity Animal life began in Precambrian period, 500-600 million years ago More than 1 million species of animals know Animals grouped into phyla (~35) based on anatomy, embryology and RNA data Vertebrates represent only one sub-phylum , and less than 5% of all animal species.
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