Organisms and Populations
Organisms and Populations BS 110
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This 1 page Class Notes was uploaded by Helen Blick Sr. on Saturday September 19, 2015. The Class Notes belongs to BS 110 at Michigan State University taught by Staff in Fall. Since its upload, it has received 12 views. For similar materials see /class/207334/bs-110-michigan-state-university in Biological Sciences at Michigan State University.
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Date Created: 09/19/15
KEY TERMS FOR ANIMAL DIVERSITY Acoelomate A solidbodied animal lacking a cavity between the gut and outer body wall Agnathan A member of a jawless class ofvertebrates represented today by the lampreys and hagfishes Anterior Referring to the head end of a bilaterally symmetrical animal bilateral symmetry Characterizing a body form with a central longitudinal plane that divides the body into two equal but opposite halves Blastopore The opening of the archenteron in the gastrula that develops into the mouth in protostomes and the anus in deuterostomes Blastula The hollow ball of cells marking the end stage of cleavage during early embryonic development Body cavity A fluidcontaining space between the digestive tract and the body wall Cephalization An evolutionary trend toward the concentration of sensory equipment on the anterior end of the body Chordate A member of a diverse phylum ofanimals that possess a notochord a dorsal hollow nerve cord pharyngeal gill slits and a postanal tail as an embryo Cleavage The process of cytokinesis in animal cells characterized by pinching of the plasma membrane specifically the succession of rapid cell divisions without growth during early embryonic development that converts the zygote into a ball of cells Closed circulatory system Circulatory systems in which blood is confined to vessels and is kept separate from the interstitial fluid Coelom A body cavity completely lined with mesoderm Coelomate An animal whose body cavity is completely lined by mesoderm the layers of which connect dorsally and ventrally to form mesenteries Determinate cleavage A type ofembryonic development in protostomes that rigidly casts the developmental fate of each embryonic cell very early Deuterostomes One oftwo distinct evolutionary lines of coelomates consisting of the echinoderms and chordates and characterized by radial indeterminate cleavage enterocoelous formation ofthe coelom and development of the anus from the blastopore Dioecious Organisms having only a single set of reproductive organs Diploblastic Having two germ layers Dorsal Pertaining to the back ofa bilaterally symmetrical animal Echinoderms Sessile or slowmoving animals that include sea stars sea urchins brittle stars crinoids and basket stars Exoskeleton A hard encasement on the surface of an animal such as the shells of mollusks or the cuticles ofarthropods that provides protection and points of attachment for muscles
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