hard or tough outer covering of many invertebrates that provides support, protects body tissues, prevents water loss, and protects the organism from predation.

internal skeleton that protects internal organs, provides support for the organism's body, and can provide an internal brace for muscles to pull against.

animal with an endoskeleton and a backbone.

animal that produces both sperm and eggs in its body, generally at different times.

fertilized egg formed when a sperm cell penetrates an egg.

internal fertilization

type of fertilization that occurs when a sperm and egg combine inside an animal's body.

external fertilization

type of fertilization that occurs when sperm and egg combine outside an animal's body.

fluid-filled ball of cells formed by mitotic cell division of the embryo.

two-cell-layer sac with an opening at one end that forms from the blastula during embryonic development.

inner layer of cells in the gastrula that develops into digestive organs and the digestive tract lining.

outer layer of cells in the gastrula that develops into nervous tissue and skin.

layer of cells between the endoderm and the ectoderm that can become muscle tissue and tissue of the circulatory, respiratory, and excretory systems.

balance or similarity in body structures of organisms

body plan that can be divided along any plane, through a central axis, into roughly equal halves.

body plan that can be divided into mirror images along only one plane through the central axis.

head end of an animal with bilateral symmetry.

tail end of an animal with bilateral symmetry.

tendency to concentrate sensory organs and nervous tissue at an animal's anterior end.

back side of an animal with bilateral symmetry.

underside or belly of an animal with bilateral symmetry.

fluid-filled body cavity completely surrounded by mesoderm.

fluid-filled body cavity between the mesoderm and the endoderm.

animal with a solid body that lacks a fluid-filled body cavity between the gut and the body wall.

coelomate animal whose mouth develops from the opening in the gastrula.

coelomate animal whose anus develops from the opening in the gastrula.

organsim that filters small particles from water to get its food.

organsima permanently attached to one place.

nematocyst-containing stinging cell on a cnidarian's tentacle.

capsule whose threadlike tube contains poison and barbs and is discharged when prey touches a cnidarian.

gastrovascular cavity

in cnidarians, the space surrounded by an inner cell layer, where digestion take place.

cnidarian nervous system that conducts impulses to and from all parts of the body.

tube-shaped, sessile body form of cnidarians.

umbrella-shaped, free swimming body form of cnidarians.

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ch 24 vocab

vocabulary

Question	Answer
invertebrate	animal without a backbone
exoskeleton	hard or tough outer covering of many invertebrates that provides support, protects body tissues, prevents water loss, and protects the organism from predation.
endoskeleton	internal skeleton that protects internal organs, provides support for the organism's body, and can provide an internal brace for muscles to pull against.
vertebrate	animal with an endoskeleton and a backbone.
hermaphrodite	animal that produces both sperm and eggs in its body, generally at different times.
zygote	fertilized egg formed when a sperm cell penetrates an egg.
internal fertilization	type of fertilization that occurs when a sperm and egg combine inside an animal's body.
external fertilization	type of fertilization that occurs when sperm and egg combine outside an animal's body.
blastula	fluid-filled ball of cells formed by mitotic cell division of the embryo.
gastrula	two-cell-layer sac with an opening at one end that forms from the blastula during embryonic development.
endoderm	inner layer of cells in the gastrula that develops into digestive organs and the digestive tract lining.
ectoderm	outer layer of cells in the gastrula that develops into nervous tissue and skin.
mesoderm	layer of cells between the endoderm and the ectoderm that can become muscle tissue and tissue of the circulatory, respiratory, and excretory systems.
symmetry	balance or similarity in body structures of organisms
radial symmetry	body plan that can be divided along any plane, through a central axis, into roughly equal halves.
bilateral symmetry	body plan that can be divided into mirror images along only one plane through the central axis.
anterior	head end of an animal with bilateral symmetry.
posterior	tail end of an animal with bilateral symmetry.
cephalization	tendency to concentrate sensory organs and nervous tissue at an animal's anterior end.
dorsal	back side of an animal with bilateral symmetry.
ventral	underside or belly of an animal with bilateral symmetry.
coelom	fluid-filled body cavity completely surrounded by mesoderm.
pseudocoelom	fluid-filled body cavity between the mesoderm and the endoderm.
acoelomate	animal with a solid body that lacks a fluid-filled body cavity between the gut and the body wall.
protostome	coelomate animal whose mouth develops from the opening in the gastrula.
deuterostome	coelomate animal whose anus develops from the opening in the gastrula.
filter feeder	organsim that filters small particles from water to get its food.
sessile	organsima permanently attached to one place.
cnidocytes	nematocyst-containing stinging cell on a cnidarian's tentacle.
nematocyst	capsule whose threadlike tube contains poison and barbs and is discharged when prey touches a cnidarian.
gastrovascular cavity	in cnidarians, the space surrounded by an inner cell layer, where digestion take place.
nerve net	cnidarian nervous system that conducts impulses to and from all parts of the body.
polyp	tube-shaped, sessile body form of cnidarians.
medusa	umbrella-shaped, free swimming body form of cnidarians.

Created by: Brittany Whitlock

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