Chapter 32 Animal Diversity Flashcards
Terms : Hide Images [1]
458494798 | cleavage | A succession of mitotic divisions without cell growth between divisions | ![]() | 0 |
458494799 | blastula | Stage where embryo is a hollow ball of cells | ![]() | 1 |
458494800 | gastrulation | When layers of embryonic tissue that will develop into body parts are produced | ![]() | 2 |
458494801 | gastrula | Stage where one end of the embryo has folded inward, forming a pouch | ![]() | 3 |
458494802 | archenteron | Pouch formed by one end of the embryo folding inward | ![]() | 4 |
458494803 | endoderm | Lines digestive tract, develops from lining of archenteron | ![]() | 5 |
458494804 | ectoderm | Covers body surfaces | ![]() | 6 |
458494805 | mesoderm | In some animals; forms muscles and most organs | ![]() | 7 |
458494806 | diploblastic | ______________ animals - have no mesoderm. Enidarians (jellies and corals) | ![]() | 8 |
458494807 | triploblastic | ____________ animals - have mesoderm | ![]() | 9 |
458494808 | metamorphosis | Resurgence of development that transforms larva into adult | ![]() | 10 |
458494809 | Cambrian explosion | When many new animal species came to be, probably due to new predator-prey relationships | ![]() | 11 |
458494810 | grade | Group of animals that share same level of organizational complexity but not necessarily descended from a common ancestor | ![]() | 12 |
458494811 | body plan | morphological and developmental traits that define a grade | ![]() | 13 |
458494812 | radial symmetry | No head or rear end, no left or right | ![]() | 14 |
458494813 | bilateral symmetry | Two-sided symmetry | ![]() | 15 |
458494814 | dorsal | Top | ![]() | 16 |
458494815 | ventral | Bottom | ![]() | 17 |
458494816 | anterior | Toward the head | ![]() | 18 |
458494817 | posterior | Toward the tail | ![]() | 19 |
458494818 | cephalization | Central nervous system in the head | ![]() | 20 |
458494819 | coelom | Tract from outer body wall | ![]() | 21 |
458494820 | coelomates | Animals that possess a true coelom | ![]() | 22 |
458494821 | pseudocoelomates | Animals that have a body cavity formed from the blastocoels | ![]() | 23 |
458494822 | acoelomates | Animals that lack a coelom | ![]() | 24 |
458494823 | protostomes | Have spiral cleavage, determinate cleavage, blastopore opening becomes the mouth | ![]() | 25 |
458494824 | spiral cleavage | Planes of cell division are diagonal | ![]() | 26 |
458494825 | determinate cleavage | Rigidly casts the fate of embryonic cells very early | ![]() | 27 |
458494826 | deutrostomes | Have radial cleavage, indeterminate cleavage, blastopore opening becomes anus; mouth forms from secondary opening | ![]() | 28 |
458494827 | radial cleavage | Cleavage planes parallel or perpendicular | ![]() | 29 |
458494828 | indeterminate cleavage | Each cell in early development retains same capacity to develop into a complete embryo | ![]() | 30 |
458494829 | choanocytes | Flagellated cells that draw water into sponge | ![]() | 31 |
458494830 | osculum | Opening where water exits | ![]() | 32 |
458494831 | amoebocytes | Digest and distribte nutrients | ![]() | 33 |
458494832 | spicules | Skeletal needles | ![]() | 34 |
458494833 | medusa | Floating, umbrella shaped body with dangling tentacles (like jellyfish) | ![]() | 35 |
458494834 | polyp | Cylinder shaped body with rising tentacles (like sea anemone) | ![]() | 36 |
458494835 | nymphs | Young small versions of adult | ![]() | 37 |
458494836 | larvae | A distinct juvenile form many animals undergo before metamorphosis into adults | ![]() | 38 |
458494837 | pupa | The life stage of some insects undergoing transformation | ![]() | 39 |
458494838 | notochord | A dorsal, flexible rod that functions as support. Usually replaced by bone during development | ![]() | 40 |
458494839 | dorsal nerve cord | A hollow cord dorsal to the notochord | ![]() | 41 |
458494840 | pharyngeal gill slits | In embryos of chordates; become gills or disappear during development | ![]() | 42 |