bio cards

what is the anterior?

top/head
what is the posterior?

bottom/feet
what is the ventral?

front/underside
what is the dorsal?

back
what is proximal?

toward the centre
what is distal?

toward the side
what is assymetry?
- -no axis of symmetry
- -sac like body plan
- -sessile
what is radial symmetry?
- -several axes of symmetry
- - sac-like body plan
- -sessile for part of life
- -allows reaching in all directions
what is bilateral symmetry?
- -one axis of symmetry
- -tube-within-a tube body plan
- -motile in one direction, leads to cephalization
what is triploblasty?
3 layers of tissue:
- endoderm
- mesoderm
- ectoderm
do porifera have triploblasty?

no, they lack an endoderm, mesoderm and ectoderm
which are diploblastic?

cnidarians
which are triploblastic?

worms

Author

Anonymous

60183

Card Set

bio cards

Description

bio cnidarians

Updated

2011-01-17T05:27:34Z

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