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20 Cards in this Set
- Front
- Back
a sheath of tissue surrounding the organs of a mollusk, producing the mollusk’s shell and performing respiration
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mantle
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an organ covered with hundreds of small teeth, used for scraping food into the mouths of mollusks
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radula
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a derivative of carbohydrates that provides both flexibility and support
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Chitin
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a circulatory system in which blood flows out of the blood vessels and into body cavities, where it comes in direct contact with cells
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open circulatory system
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a circulatory system in which the blood always remains in vessels
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closed circulatory system
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the process of shedding an exoskeleton and replacing it with a new one
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molting
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the anterior part of an arthropod body, consisting of a head and other body segments fused together
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cephalothorex
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an armored shield that covers the anterior portion of crustaceans
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carapace
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a network of water-filled canals in echinoderms, used for locomotion and feeding
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water vascular system
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a channel along the oral surface of echinoderms through which the tube feet protrude
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ambulacral groove
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a flexible supportive rod that runs the length of the body of the chordates
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notochord
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a long bundle of nerve cells located along the dorsal part of an organism’s body
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dorsal nerve chord
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Explain the pentamerous symmetry of the echinoderms?
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type of radial symmetry and have 5 radiating arms
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In an aquarium, you see a recently eaten clam with its shell open and much of its internal body part is missing. The only other organism in the aquarium is a starfish. Could this animal have eaten the clam? How did it penetrate the clam’s hard shell?
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its stomach comes out of its mouth and sucks in the food and then it comes back in
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A brittle star is being attacked by a hungry fish that has a hold of one of its arms. The brittle star instinctively releases its arms and crawls away, avoiding getting eaten. Why was it so willing to detach its arms?
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a defense mechanism- it can let go of a part of its body to get away from predators and then it will grow back
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What are some of the strategies that enable the gametes of echinoderms to more likely come in contact with one another when they are released into the water column?
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gametes are released during a short season; individuals of the same species are going to release gametes when there are like species in the area
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Tunicates do not have a notochord in their adult forms. What feature gives their bodies support?
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they have a leather like tunic covering for support
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The member of the phylum Chordata are a very diverse group of organisms. What are two similarities among all these animals?
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dorsal never cord & notochord
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A diver sees a rounder organism on the sea floor that has two openings. Water flows in and out of the opening. The diver says it is a sponge. What else could it be?
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sea squirt
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What is the purpose of the atrial cavity in a lancelet?
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collects water that the land slit takes in for filtering and sends it out the body through the atriopore
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