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Chapter 3-1
What is a Vertebrate
7
Science
6th Grade
06/21/2007

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Term
CHORDATES
Definition
all chordates share three characteristics: at some point in their development, they have a notochord, a nerve chord, and a pharyngeal slits
Term
NOTOCHORD
Definition
a flexible rod that supports the animal's back
Term
CARTILAGE
Definition
a tissue that is softer than bone, but flexible and strong
Term
ENDOSKELETON
Definition
an internal skeleton that supports and protects the body, helps give it shape, and gives muscle a place to attach
Term
ECTOTHERM
Definition
an animal whose body does not produce much internal heat-its body temperature changes depending on the temperature of its environment
-most fishes, amphibians, and reptiles are ectotherms
Term
ENDOTHERM
Definition
an animal whose body controls and regulates its temperaure by controlling the internal heat it produces through adaptations sucha s fur, feathers, or sweat glands
Term
Body Temperatue
Definition
-most fishes, amphibians, and reptiles have a boby temperature that is close to the temperature of their environment
-birds and mammals have a stable body temperature that is typically much warmer than their environment
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