Phylum Mollusca Flashcards
1
Q
Pro or Deut?
A
Protostome
2
Q
Layers
A
triploblastic: coelomate (space btn gut & body wall derived from mesoderm)
3
Q
Digestion
A
complete digestive tract
4
Q
Respiration
A
gills – specialized respiratory structure
purpose: increase surface area for diffusion of gases
5
Q
Excretion
A
nephridia: structures excretory
6
Q
skeleton
A
hydrostatic skeleton
7
Q
Symmetry
A
bilateral symmetry w/ cephalization
8
Q
Level of Organization
A
organ system level of organization
9
Q
Nervous System
A
ganglia + nerve network
10
Q
What kind of circulatory system?
A
- open circulatory system
- means that they lack capillaries so blood just oozes out of top of organ
- exchange btn organs & blood takes place in hemocoel
- → slow blood flow
11
Q
2 Body Regions
A
- head-foot: responsible for sensory & locomotion
- visceral mass – where everything else takes place: reproduction, digestion, circulation, excretion
12
Q
Shell
A
- _ calcareous shell_ (not all have them)
- secreted by mantle
13
Q
Layers of Calcareous Shell
- periostracum
A
outermost layer, made of protein
14
Q
Layers of Calcareous Shell
- prismatic layer
A
middle layer, made of organic molecules & calcium carbonate, glossy sheen
15
Q
Layers of Calcareous Shell
- Nacreous Layer
A
innermost layer, calcium carbonate alternating w/ organic
