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28 Cards in this Set
- Front
- Back
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cell junction
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connections between cells that hold the cell together
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differentiation
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cells become different from eachother
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ingestion
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an animal takes in organic material, in the form of other things
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invertebrate
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animals without a backbone
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neuron
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cells of nervous tissue that conduct electrical impulses through the body
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specialization
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adaptation of a cell for a particular function
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vertebrate
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an animal with a backbone such as a horse,shark, or eagle
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zygote
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the first cell of a new individual
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anterior
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head
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bilateral symmetry
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two similar halves on either side of a central plane
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cephalization
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what bilateral ones demonstrate..
concentration of sensory organs and brain structures in the anterior end of the animal... an animal that has a head |
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chordate
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11th phylum..
refers to the notochord, dorsal nerve cord, pharyngeal pouches, post anal tail |
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dorsal
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top
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dorsal nerve cord
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hollow tube lying just above to notochord
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germ layer
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fundamental tissue types found in the embryos of all animals except sponges, which have no true tissues
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notochord
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a firm, flexible layer of tissue located in the dorsal part of the body
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pharyngeal pouch
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small outpockets of the anterior part of the digestive tract
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postanal tail
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consists of muscle tissue and lies behind the posterior opening of the digestive tract
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posterior
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tail/end
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radial symmetry
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similar parts branch out from 1 directions from one central line
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symmetry
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constant overall pattern of structure
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ventral
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bottom
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circulatory system
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moves blood or a similar fluid through the body to transport oxygen and nutrients to cells
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closed circulatory system
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blood circulates through the body in tubular vessels
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direct development
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young animal is born or hatches with the same appearance and way of life it will have as an adult; no larval stage occurs; grasshoppers undergo this
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endoskeleton
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an internal skeleton that can support a large heavy body
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exoskeleton
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rigid outer covering that protects the soft tissues of many animals including arthropods, such as lobsters, and mollusks, such as clams
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gas exchange
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animals produce co2 as a byproduct of metabolism.. and therefore carbon dioxide in the blood must be exchanged with oxygen from the environment. It occurs most efficiently across a moist membrane
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