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Chapter 32
Vocabulary required by my teacher for Chapters 32 in the Campbell Biology Book
34
Biology
11th Grade
12/18/2011

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Term
anterior
Definition
Referring to the head end of a bilaterally symmetrical animal.
Term
archenteron
Definition
The endoderm-lined cavity, formed during the gastrulation process, that develops into the digestive tract of an animal.
Term
bilateral symmetry
Definition
Characterizing a body form with a central longitudinal plane that divides the body into two equal but opposite halves.
Term
blastopore
Definition
The opening of the archenteron in the gastrula that develops into the mouth in protostomes and the anus in deuterostomes.
Term
blastula
Definition
The hollow ball of cells marking the end stage of cleavage during early embryonic development.
Term
body cavity
Definition
A fluid-containing space between the digestive tract and the body wall.
Term
Cambrian explosion
Definition
A burst of evolutionary origins when most of the major body plans of animals appeared in a relatively brief time in geologic history; recorded in the fossil record about 545–525 million years ago.
Term
cephalization
Definition
An evolutionary trend toward the concentration of sensory equipment on the anterior end of the body.
Term
cleavage
Definition
The process of cytokinesis in animal cells, characterized by pinching of the plasma membrane; specifically, the succession of rapid cell divisions without growth during early embryonic development that converts the zygote into a ball of cells.
Term
coelom
Definition
A body cavity completely lined with mesoderm.
Term
deuterostome development
Definition
In animals, a developmental mode distinguished by the development of the mouth from the blastpore; often also characterized by schizocoelous development of the body cavity and by spiral cleavage.
Term
diploblastic
Definition
Having two germ layers.
Term
dorsal
Definition
Pertaining to the back of a bilaterally symmetrical animal.
Term
ecdysozoan
Definition
Member of a group of animal phyla with protostome development that some systematists hypothesize form a clade, including many molting animals.
Term
ectoderm
Definition
The outermost of the three primary germ layers in animal embryos; gives rise to the outer covering and, in some phyla, the nervous system, inner ear, and lens of the eye.
Term
endoderm
Definition
The innermost of the three primary germ layers in animal embryos; lines the archenteron and gives rise to the liver, pancreas, lungs, and the lining of the digestive tract.
Term
gastrula
Definition
The three-layered, cup-shaped embryonic stage.
Term
gastrulation
Definition
The formation of a gastrula from a blastula.
Term
germ layers
Definition
Three main layers that form the various tissues and organs of an animal body.
Term
ingestion
Definition
A heterotrophic mode of nutrition in which other organisms or detritus are eaten whole or in pieces.
Term
larva
Definition
(plural, larvae) A free-living, sexually immature form in some animal life cycles that may differ from the adult in morphology, nutrition, and habitat.
Term
lophophore
Definition
A horseshoe-shaped or circular fold of the body wall bearing ciliated tentacles that surround the mouth.
Term
mesoderm
Definition
The middle primary germ layer of an early embryo that develops into the notochord, the lining of the coelom, muscles, skeleton, gonads, kidneys, and most of the circulatory system.
Term
metamorphosis
Definition
The resurgence of development in an animal larva that transforms it into a sexually mature adult.
Term
parazoan
Definition
Animal belonging to a grade of organization lacking true tissues (collections of specialized cells isolated from other tissues by membranes); a sponge (phylum Porifera).
Term
posterior
Definition
Pertaining to the rear, or tail, of a bilaterally symmetrical animal.
Term
protostome development
Definition
In animals, a developmental mode distinguished by the development of the anus from the blastopore; often also characterized by enterocoelous development of the body cavity and by radial cleavage.
Term
pseudocoelomate
Definition
An animal whose body cavity is not completely lined by mesoderm.
Term
radial cleavage
Definition
A type of embryonic development in deuterostomes in which the planes of cell division that transform the zygote into a ball of cells are either parallel or perpendicular to the polar axis, thereby aligning tiers of cells one above the other.
Term
radial symmetry
Definition
Characterizing a body shaped like a pie or barrel, with many equal parts radiating outward like the spokes of a wheel; present in cnidarians and echinoderms.
Term
spiral cleavage
Definition
A type of embryonic development in protostomes, in which the planes of cell division that transform the zygote into a ball of cells occur obliquely to the polar axis, resulting in cells of each tier sitting in the grooves between cells of adjacent tiers.
Term
triploblastic
Definition
Possessing three germ layers: the endoderm, mesoderm, and ectoderm. Most eumetazoans are triploblastic.
Term
trochophore
Definition
Distinctive larval stage observed in annelids and molluscs.
Term
ventral
Definition
Pertaining to the underside, or bottom, of a bilaterally symmetrical animal.
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