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24 Cards in this Set
- Front
- Back
hollow ball of cells that gives rise to all the tissues and organs of an adult body
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blastula
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in animals, the outer layer of embryonic tissue from which the skin and nervous system develop
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ectoderm
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inner layer of embryonic tissue from which the digestive organs develop in animals
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endoderm
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middle layer of embryonic tissue in animals from which the skeleton and muscles develop
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mesoderm
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an animals shape, symmetry, and internal organization
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body plan
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irregular in shape
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asymmetrical
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arrangement of body parts around a central axis
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radical symmetry
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arrangement of body parts so there are distinct left and right halves that mirror each other
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bilateral symmetry
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in bilaterally symmetric animals, the development of a head end with a concentration of nerves and sensory structures
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cephalization
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fluid-filled body cavity that forms between the body wall and the digestive tract
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coelom
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animal that lacks a coelom, or body cavity
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acoelomate
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animal with a body cavity located between the endoderm and the mesoderm
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pseudocolomate
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fluid-filled body cavity that forms between the body wall and the digestive tract
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coelomate
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branching diagram that shows how animals are related through evolution
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phylogenic tree
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a digestive cavity with only one opening; found in simple animals
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gastrovascular cavity
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simultaneous uptake of oxygen and release of carbon dioxide, by lungs, gills, or through the skin
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respiration
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extremely thin projection of tissue rich in blood vessels that is the site of gas exchange in aquatic and a few terrestrial animals
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gill
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system in which blood leaves the blood vessels and bathes the body’s tissues
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open circulatory system
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support structure that consists of water contained under pressure in a closed captivity
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hydrostatic skeleton
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hard external covering of some invertebrates
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exoskeleton
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an internal skeleton composed of a hard material, such as bone
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endoskeleton
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organism with both testes and ovaries
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hermaphrodite
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union of egg and sperm occurring outside the body of either parent
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external fertilization
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fertilization that occurs within the body of the female parent
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internal fertilization
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