Bio 2.2 Lab Exam 2: Echinodermata
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An animal that during development the blastopore develops into the anus instead of the mouth.
What type of symmetry to sea stars have?
What is located on the tips of star fish's arms?
Chemoreceptors and eye spots.
Do starfish have an excretory system?
What does it mean to be an osmoconformer?
You must maintain the osmotic concentration of the environment.
What are the 5 classes of echinoderms?
What class of echinoderms are the brittle stars in?
What class of echinoderms are the sand dollars and sea urchins in?
What class of echinoderms are the sea cucumbers in?
What class of echinoderms are the sea lillies and feather stars in?
What is the endoskeleton of a starfish made of?
Calcium carbonate plates called dermal ossicles.
What are skeletal spines used for?
How does a starfish move?
The collagen in its endoskeleton softens, changes shape, and hardens again.
What are pedicellareae?
Tiny calcareous pincers around the base of the spines.
What is the aboral side of a starfish?
The side without the mouth.
What are papulae?
Pouches in the coelomic cavity that extend through gaps in the dermal ossicles.
They are the primary respiratory surface and diffuse waste.
What is the primary respiratory surface for starfish?
What is the madreporite?
A white plate on the aboral side of a starfish that serves as an inlet for water.
What is the oral side of the starfish?
The side where the mouth is located.
How does digestion work in a starfish?
Pyloric cecae (digestive glands) secrete enzymes into pyloric ducts which runs toward the pyloric stomach.
What are the tops of the tube feet called?
What are ampulla?
The tops of the tube feet.
What is the stone canal used for?
It takes water down to the ring canal and out the radial canals that run down each arm.
What fills the ampullae with water?
Lateral canals with one-way valves branching off of the radial canal.
How does the water-vascular system work in starfish?
Ampullae have circular muscle around them while the tube feet have longitudinal muscles.
When muscle in the ampullae contract, the tube feet extend outward.
The suction cup on the end of the tube foot attaches to something and the longitudinal muscles contract making a suction.
- A: Spines
- B: Pyloric Cecae (Digestive Glands)
- C: Gonads
- D: Radial Canal
- E: Ampullae
- F: Mouth
- A: Madreporite
- B: Pyloric Stomach
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