AP Bio 6 - Animals Animals Heterotrophs Multicellular eukaryotes Lack cell walls bodies are held together by structural proteins Ie collagen Nervous

AP Bio 6 - Animals Animals Heterotrophs Multicellular...

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10/5/09 Animals
10/5/09 Animals Heterotrophs Multicellular eukaryotes Lack cell walls bodies are held together by structural proteins Ie. collagen Nervous tissue and muscle tissue are unique to animals Most animals reproduce sexually , with the diploid stage usually
10/5/09 Animals sperm fertilizes an egg zygote undergoes cleavage, leading to formation of a blastula blastula undergoes gastrulation embryonic tissue layers and a gastrula form
10/5/09 LE 32-2_3 Zygote Eight-cell stage Cleavag e Blastula Cross section of blastula Cleavag e Blastoc oel Blastoc oel Endode rm Ectoder m Gastrul a Blastopo re Gastrulatio n
10/5/09 Animals Many animals have at least one larval stage larva is sexually immature and morphologically distinct from the adult eventually undergoes metamorphosis
10/5/09 Animals - Symmetry LE 32-7a Radial symmetry
10/5/09 Animals - Symmetry LE 32-7b Bilateral symmetry
10/5/09 Animals - Symmetry Bilaterally symmetrical animals have: A dorsal (top) side and a ventral (bottom) side A right and left side Anterior (head) and posterior (tail) ends Cephalization the development of a head
10/5/09 Animals - Tissues Tissues = collections of specialized cells isolated from other tissues by membranous layers Germ layers Concentric layers in animal embryos Form tissues and organs
10/5/09 Animals - Tissues Ectoderm the germ layer covering the embryo’s surface Endoderm the innermost germ layer Diploblastic animals have ectoderm and endoderm Triploblastic animals also have an intervening
10/5/09 Animals – Body Cavities In triploblastic animals, a body cavity may be present or absent coelom True body cavity derived from mesoderm
10/5/09 LE 32-8a Coelo m Coelomate Body covering (from ectoderm) Digestive tract (from endoderm) Tissue layer lining coelom and suspending internal organs (from mesoderm)
10/5/09 Animals – Body Cavities Pseudocoelom body cavity derived from the blastocoel, rather than from mesoderm LE 32-8b Body covering (from ectoderm) Digestive tract (from endoderm) Muscle layer (from mesoderm) Pseudocoel om Pseudocoelomat e
10/5/09 Animals – Body Cavities Acoelomates organisms without body cavities LE 32-8c Body covering (from ectoderm) Wall of digestive cavity (from endoderm) Acoelomate Tissue- filled region (from mesoderm )
10/5/09 Animals Protostome Deuterostome Cleavage is spiral and determinate cleavage is radial and indeterminate LE 32-9a Protostome development (examples: molluscs, annnelids, arthropods) Deuterostome

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