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Ch 25
vocab
18
Biology
10th Grade
04/13/2011

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Term
Bilateral Symmetry
Definition
body plan in which a single imaginary line can divide the body into left and right sides that are mirror images of each other
Term
Blastula
Definition
hollow ball of cells that develops when a zygote undergoes a series of cell divisions
Term
Cephalization
Definition
concentration of sense organs and nerve cells at the anterior end of an animal
Term
Chordate
Definition
 animal that has, for at least one stage of its life, a dorsal, hollow nerve cord, a notochord, a tail that extends beyond the anus, and pharyngeal pouches
Term
Coelom
Definition
body cavity lined with mesoderm
Term
Deuterostome
Definition
group of animals in which the blastopore becomes an anus and the mouth is formed from the second opening that develops
Term
Ectoderm
Definition
outermost germ layer; produces sense organs, nerves, and outer layer of skin
Term
Endoderm
Definition
innermost germ layer; develops into the linings of the digestive tract and much of the respiratory system
Term
Feedback Inhibition
Definition
 process in which a stimulus produces a response that opposes the original stimulus; also call negative feedback
Term
Invertebrate
Definition
animal that lacks a backbone, or vertebral column
Term
Mesoderm
Definition
middle germ layer; develops into muscles, and much of the circulatory, reproductive, and excretory systems
Term
Notochord
Definition
long supporting rod that runs through a chordate’s body just below the nerve cord
Term
Pharyngeal Pouch
Definition
one of a pair of structures in the throat region of a chordate
Term
Protostome
Definition
an animal whose mouth is formed from the blastopore
Term
Pseudocoelum
Definition
body cavity that is only partially lined with mesoderm
Term
Radial Symmetry
Definition
body plan in which any number of imaginary planes drawn through the center of the body could divide it into equal halves
Term
Vertebrate
Definition
animal that has a backbone
Term
Zygote
Definition
fertilized egg
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