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Bio 106 Class Asteroidea Function/Structure
Bio 106 Class Asteroidea Function/Structure
20
Zoology
Undergraduate 2
11/14/2017

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Term
EXTERNAL STRUCTURE/FUNCTION
Spines
Definition
Calcereous projections for protection and support
Term
EXTERNAL STRUCTURE/FUNCTION
Pedicellariae
(2)
Definition
Pincher-like structures
Keeps epidermis (aboral surface) free of parasites and algea
Term
EXTERNAL STRUCTURE/FUNCTION
Dermal Branchiae
(2)
Definition
Gas exchange
Excretion (simple diffusion)
Term
EXTERNAL STRUCTURE/FUNCTION
Mouth
Definition
External opening from esophagus to cardiac stomach
Term
EXTERNAL STRUCTURE/FUNCTION
Anus
Definition
Regulates egestion (feces) from body
Term
EXTERNAL STRUCTURE/FUNCTION
Madreporite
(3)
Definition
Porous opening to water vascular system
Pressure regulator
Simple filter
Term
EXTERNAL STRUCTURE/FUNCTION
Ambulacral Grooves
(2)
Definition
Radiate from mouth to tip of each arm
Houses tube feet
Term
EXTERNAL STRUCTURE/FUNCTION
Tube Feet
(2)
Definition
Locomotion
Prey capture
Term
Astroidea Genus Name
Definition
Asterias
Term
INTERNAL STRUCTURE/FUNCTION
Cardiac Stomach
(2)
Definition
Everted through mouth to envelope prey
Site of initiation digestion
Term
INTERNAL STRUCTURE/FUNCTION
Pyloric Stomach
Definition
Recieves digestive gland secretions for chemical digestion
Term
INTERNAL STRUCTURE/FUNCTION
Digestive Glands
(3)
Definition
Secretes digestive enzymes
Major role in absorption and storage of food materials
Connect to pyloric stomach through pyloric ducts
Term
INTERNAL STRUCTURE/FUNCTION
Rectal Ceca
(2)
Definition
Sm, branched trees
Increase surface area of intestine for more efficient nutrition absorption
Term
INTERNAL STRUCTURE/FUNCTION
Gonads
Definition
Produce gametes
Term
INTERNAL STRUCTURE/FUNCTION
Ring Canal
Definition
Portion of water vascular system encircling mouth
Term
INTERNAL STRUCTURE/FUNCTION
Radial Canals
(2)
Definition
Portions of water vascular system emanating from ring canal
Leads into each arm
Term
INTERNAL STRUCTURE/FUNCTION
Stone Canal
Definition
Portion of water vascular system leading from madreporite to ring canal
Term
INTERNAL STRUCTURE/FUNCTION
Ampullae
Definition
Provides hydraulic pressure for movement of tube feet
Term
INTERNAL STRUCTURE/FUNCTION
Ossicles of Endoskeleton
Definition
Support
Term
Class Asteroidea Characteristics
(3)
Definition
Broad arms, indistinct from central disc
Tube feet w/ suckers in ambulacral grooves
Anus and madreporite present on aboral surface
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