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21 Cards in this Set

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acanthodian
early fish; first to exhibit jaws
agnathan
earliest fish; had backbone but no jaws or paired fins
cartilage
strong, lightweight, flexible, connective tissue
countercurrent flow
arrangement in fish respiratory system where water going over the gills and blood in the gill filaments flows in the opposite directions
ectothermic
reffering to an animals whose body temperature is determined by the temperature of the environment
endothermic
refers to an animal that generates its own body heat
gill filament
fingerlike projection from a gill where respiratory gases enter and leave the blood
gill slit
opening at the rear of a fish's cheek caivty where water exits
lateral line
specialized sensory system running the length of both sides of a fish's body
lung
internal, baglike resperatory organ of a vertebrate that enables gas exchange between the sir and the blood
nephron
tubelike structure in the kidneys that filters wastes from the body and retains useful molocules; also regulates bodies salt and water balance
operculum
hard plate that covers the gills on each side of the head of bony fishes
pangaea
the single super-continent of the triassic period that included all presently known continents
pulmonary vein
vessel that carries oxygen- rich blood from the lungs to the heart
septum
thick wall that divides the hearts atrium or ventricle into right and left halves
swim bladder
the gas-filled sac of bony fishes used to regulate bouynacy
teleost
group of bony fishes wiht hilgy mobile fins, thin scales, a swim bladder, and symmetrical tails; largest group of living fish
terrestrial
term that describes an organsim with the ability to live on land
thecondont
extinct crocodile-like reptile from which the dinosoars were evilved
therapsid
extinct order of reptiles thought to be endothermic that lickley gave rise to mammals
vertebra
individual segment of a backbone