Biology: Chapter 31

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Biology Words

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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