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Chapter 14 Key Terms
The keyterms from chapter 14.
15
Science
7th Grade
05/01/2011

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Term
amniotic egg
Definition
egg covered with a shell that provides a complete environment for the embryo's development
Term
cartilage
Definition
tough, flexible tissue that joins vertebrae and makes up all or part of the vertebrate endoskeleton
Term
chordate
Definition
animal that has a notochord, a nerve cord, pharyngeal pouches, and a postanal tail present at some stage in its development
Term
ectotherm
Definition
vertebrate animal whose internal temperature changes when the temperature of its environment changes
Term
endoskeleton
Definition
supportive framework of bone and/or cartilage that provides an internal place for muscle attachment and protects a vertebrate's internal organs
Term
endotherm
Definition
vertebrate animal with a nearly constant internal temperature
Term
estivation
Definition
inactivity in hot, dry months
Term
fin
Definition
structure used by fish for steering, balancing, and movement
Term
hibernation
Definition
inactivity in cold weather
Term
nerve cord
Definition
tubelike structure above the notochord that in most chordates develops into the brain and spinal cord
Term
notochord
Definition
firm but flexible structure that extends along the upper part of a chordate's body
Term
pharyngeal pouch
Definition
in developing chordates, that paired openings found in the area between the mouth and digestive tube
Term
postanal tail
Definition
muscular structure at the end of a developing chordate
Term
scale
Definition
thin, hard plate the covers a fish's skin and protects its body
Term
vertebrate
Definition
animal with a backbone
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