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49 Cards in this Set

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