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ch.24 vocab

QuestionAnswer
invertebrate animal without a backbone
exoskeleton hard or tough outer covering of many invertebrate that provides support projects body tissues prevents water loss and protects the organism from predation.
endoskeleton internal skeleton that protects interal organs provides support for the organisms 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 egg 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 sperm and egg combine inside an animals body.
external fertilization type of fertilization that occurs when sperm and egg combine outside an animals body.
blastula fluid filledd 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.
ecoderm 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 fo the circulatory respiratory and excretory systems
symmetry balance or similarity in body structures of organisms
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.
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.
radial symmetry body plan that can be divided along any plane through a central axis into roughly equal halves.
posterior tail end of an animal with bilateral symmetry
cephalization tendency to concentrate sensory organs and nervous tissue at an animals anterior end.
dorsal backside of an animal with bilateral symmetry.
ventral underside or belly of an animal wiht bilateral symmetry.
filter feeder
cephalization tendency to concentrate sensory organs and nervous tissue at an animals anterior end.
coelom fluid filled body cavity completely surrounded by mesoderm.
dorsal backside of an animal with bilateral symmetry.
dorsal backside of an animal with bilateral symmetry.
ventral underside or belly of an animal wiht bilateral symmetry.
ventral underside or belly of an animal wiht bilateral symmetry.
coelom fluid filled body cavity completely surrounded by mesoderm.
coelom fluid filled body cavity completely surrounded by mesoderm.
pseudocoelom fluid filled body cavity between the mesoderm and thee endoderm
pseudocoelom fluid filled body cavity between the mesoderm and thee endoderm
acoelomate animal with a solid body that lacks a fluid filled body cavity between the gut and the body wall.
filter feeder
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
sessile organisms permanently attached to one place
nerve net cnidarian nervous system that conducts impulses to and form all parts of the body.
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.
cnidocytes nematocyst contianing stinging cell on a cnidarians tentacle.
polyp tube shaped sessile body form of cnidarians
medusa umbrella shaped free swimming body form of cnidarians
Created by: joelsawyer
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