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15 Cards in this Set
- Front
- Back
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invertebrate
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an animal that lacks a backbone
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skeleton
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a structure in animals and humans that provides mechanical support for muscle attachment and maintaining body shape
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filter feeder
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an organism that obtains food from water circulating through its body
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nematocyst
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a type of stinging cell possessed by cnidarians; used for defense or for capturing food
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radial symmetry
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a type of symmetry in which several different planes could divide an animal int equal halves
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bilateral symmetry
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a type of symmetry in which there are two equal symmetry sides to an animal; only one plane can divide it into equal halves
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neuron
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a long thin nerve cell that carries impulses between various parts of the body
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nerve
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a number of neurons arranged side by side and wrapped in a protective covering
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ganglion
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a mass of nerve tissues; sometimes called a simple brain
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stimulus
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anything that causes a response in an organism
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sensory receptor
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a structure capable of recieving a stimulus from the environment and sending an impulse along a neuron
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closed circulatory system
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a type of circulatory system in which the blood remains in vessels
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aortic arches
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organs that help to control blood pressure in earthworms
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capillary
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one of many small blood vessels that have walls that are one cell thick; materials are exchanged between the blood and other body tissues in the capillaries
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veins
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a blood vessel that carries blood to the heart
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