Biology: Chapter 31

Biology: Chapter 31 Biology Words
Changes are done, please view the flashcard.

Preview Flashcards

Front Back
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
Enter Password

  

Upgrade and get a lot more done!
Upgrade