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49 Cards in this Set
- Front
- Back
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endoskeleton
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skeleton inside the body that protects inside organs and gives the body support
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notochord
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strong, flexible, rod-like structure in chordates that can bend
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vertebrate
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animals with a backbone
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chordates
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animals that have a notochord at some time during their development
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hollow nerve cord and gill slits
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Some more features that all chordates have
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Three things that all chordates have
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a left and a right side, a head and tail end, and three tissue layers
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The three tissue layers of chordates
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the endoderm, the mesoderm and the ectoderm
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back of the animal
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Where the nerve cord of a chordate runs down
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Chordata
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all animals in this phylum have a notochord
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cartilage
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kind of strong, flexible tissue
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coldblooded
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having a body temperature that changes with the temperature of the surroundings
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gills
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Feathery organs that absorb dissolved oxygen from water. Fish breathe thru them.
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500 million
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Fishes first appeared this many years ago
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two
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The number of chambers that a fish's heart have
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ventricle
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the bottom chamber of a two-chambered heart
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atrium
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the top chamber of a two-chambered heart
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jawless, cartilaginous and bony fishes
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The three classes that fishes are classified in
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Lampreys and hagfish
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The only two kinds of jawless fishes.
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sharks, rays and skates
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Types of cartilaginous fishes
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cartilaginous fish
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These fish have skeletons made of cartilage
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bony fish
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These fish have skeletons made of bone
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tuna, salmon, bass ad flounder
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Types of bony fishes
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scales
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They cover and protect the skin of bony fish
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streamlined bodies, fins and a body covered with scales
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Characteristics of bony fishes
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T or F. In most adult chordates, the notochord is replaced by a backbone
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True.
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fish, amphibians and reptiles
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jawless fishes
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These fishes are long and snakelike, no scales and slimy skin
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lancelot
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This fish keeps its notochord throughout its life. It is never replaced by a backbone.
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Chordata
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fishes, frogs, snakes, birds, cats
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Fish breathe through ______.
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gills
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amphibian
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Animals that spend part of their life in water and part on land
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"double life"
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Amphibian comes from a Greek word that means this
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Scientists think that the first amphibians developed from fish that could stay out of water for __________.
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long periods of time.
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Gills, lungs and their skin
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Amphibians use these to exchange oxygen and carbon dioxide.
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Frogs and toads
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Types of tailess amphibians
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Salamanders
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Types of amphibians with tails
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Amphibians are __________.
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cold-blooded.
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Three
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The number of orders that scientists classify amphibians.
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Scientists classify amphibians based upon their ________.
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body structure
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Tailess, with tails and without legs
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The three orders of amphibians
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bumpy skin
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The type of skin toads have
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Smooth, moist skin
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Amphibians (except for toads) have this type of skin
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Amphibians must keep their skin moist so that oxygen and carbon dioxide can be exchanged thru their skin.
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True.
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Cold-blooded with smooth skin and webbed feet
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Characteristics of amphibians.
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Amphibians have three-chambered hearts, gills when young, and lungs as adults.
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The heart has two atria and one ventricle
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Parts of a three-chambered heart.
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All amphibians lay eggs without shells in the water.
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In coldblooded animals, body temperature _______ as the outside temperature changes.
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changes
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Birds are the only animals with feathers, have two wings and two legs, have lightweight bones, a beak and lay eggs.
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