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Invert Chapter 5

QuestionAnswer
true or false: metazoans are a clade true
metazoans are heterotrophic multicellular eukaryotes that undergo embryogenesis by way of tissue layering. SO IMPORTANT!
what process is the formation of embryonic germ layers? gastrulation
four phyla of Metazoa Cnidaria, Ctenophora, Placozoa, and Porifera
aquiferous system the water current channel system
choanocytes all purpose cells that do pumping, feeding, gas exchange, and waste expulsion
pinacoderm the outer surface cells of a sponge make up the pinacoderm
pinacocytes, the outer surface cells
choanocytes flagellated cells
vanes long flagellum has a basal, bilaterally arranged pair of wing-shaped projections
collar microvilli containing actin filaments, the microvilli being connected to one another via a thin membrane composed of a meshwork of extracellular glycoprotein (the glycocalyx mesh
exopinacoderm a simple external sheet
exopinacocytes cells on the external sheet
syconoid condition the choanoderm may become folded
asconoid condition adult Calcarea may retain a largely unfolded, simple, and continuous choanoderm
atrium The thin walls enclose a central cavity
ectosome the mesohyl may thicken and appear to have two layers. The outer layer - contains an accumulation of spicules that are different from those found in the interior portion of the mesohyl.
prosopyles the openings from the channels to choanocyte chambers
excurrent canals carry water from the choanocyte chambers to the oscula
in a sponge, where are velocities the lowest choanoderms
trabecular syncytium The main tissue of the hexactinellid
Created by: ablau
 

 



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