Biology: Chapter 31

Biology Words
Created Nov 7, 2011
by jpfrumgrap
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Side ASide B
cleavage
first few cell division of a zygote
cleavage patterns
influenced by configuration of yolk
radial cleavage 
echinoderms fertized egg in an even COMPLETE patten
Spiral cleavage 
Lophotrochozoans .complicated cluster of radial symmetry
diploblastic
two cell layers ectoderm(outer) endoderm (inner)
tripoblastic
also contain a mesoderm
protosomes 
mouth first 
deuterostomes 
anus forms firs 
gastrulation
hollow ball of cells indent
bilaterans
have either deuterosme or protosome gastrulation, most animals 
body plan 
general structure of animan and organ system and functioning
spherical symmetry 
simplest form, body parts radiate out from a central point.  (unicellular protist)
radial symmetry 
body parts are arranged around one main axis, sesile
bilateral symmetry
distinct front end  , mirror image
anterior 
front of the body 
posterior 
end or rear 
ventral side 
stomach or belly, underside
dorsal
back
cephalization
sensory organs in head 
acoelomate
lack enclosed fluid filled body cavity , use beating cilia 
pseudocoelomate
body cavity that is fluid filled and organs are suspended , internal organs are not enclosed 
coelomate 
body cavity that develops within mesoderm . peritoneum encloses the internal organs 
hydrostatic skeletons
when muscles contract fluid shifts to another part of the cavity
segmentation 
facilitates specialization of different body regions  
detrivores 
feed on dead organic material 
filter feeders
strain food from enviornment 
choancytes
beating flagella of specialized feeding cells 
nematocysts 
stinging cells
dispersal 
movement of organisms from a parent organism
trochophore
radial symetric larval form on  bottom of ocean
nauplius 
bilaterally symmetrical larval form 
altrical young 
taken care of 
precocial
independent from birth 
bilateria 
bilateral symmetry, atleasts 7 hox genes  
eumetazoans
have guts organs  body symmetry, nervous system 


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