Biology: Chapter 31

35 cards

Biology Words


 
  
Created Nov 7, 2011
by
jpfrumgrap

 

 
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1
cleavage
 
first few cell division of a zygote
2
cleavage patterns
 
influenced by configuration of yolk
3
radial cleavage 
 
echinoderms fertized egg in an even COMPLETE patten
4
Spiral cleavage 
 
Lophotrochozoans .complicated cluster of radial symmetry
5
diploblastic
 
two cell layers ectoderm(outer) endoderm (inner)
6
tripoblastic
 
also contain a mesoderm
7
protosomes 
 
mouth first 
8
deuterostomes 
 
anus forms firs 
9
gastrulation
 
hollow ball of cells indent
10
bilaterans
 
have either deuterosme or protosome gastrulation, most animals 
11
body plan 
 
general structure of animan and organ system and functioning
12
spherical symmetry 
 
simplest form, body parts radiate out from a central point.  (unicellular protist)
13
radial symmetry 
 
body parts are arranged around one main axis, sesile
14
bilateral symmetry
 
distinct front end  , mirror image
15
anterior 
 
front of the body 
16
posterior 
 
end or rear 
17
ventral side 
 
stomach or belly, underside
18
dorsal
 
back
19
cephalization
 
sensory organs in head 
20
acoelomate
 
lack enclosed fluid filled body cavity , use beating cilia 
21
pseudocoelomate
 
body cavity that is fluid filled and organs are suspended , internal organs are not enclosed 
22
coelomate 
 
body cavity that develops within mesoderm . peritoneum encloses the internal organs 
23
hydrostatic skeletons
 
when muscles contract fluid shifts to another part of the cavity
24
segmentation 
 
facilitates specialization of different body regions  
25
detrivores 
 
feed on dead organic material 
26
filter feeders
 
strain food from enviornment 
27
choancytes
 
beating flagella of specialized feeding cells 
28
nematocysts 
 
stinging cells
29
dispersal 
 
movement of organisms from a parent organism
30
trochophore
 
radial symetric larval form on  bottom of ocean
31
nauplius 
 
bilaterally symmetrical larval form 
32
altrical young 
 
taken care of 
33
precocial
 
independent from birth 
34
bilateria 
 
bilateral symmetry, atleasts 7 hox genes  
35
eumetazoans
 
have guts organs  body symmetry, nervous system 


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