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21 Cards in this Set

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  • Back
vertebra
individual segment of a back bone
agnathan
earliest fish which had a back bone but had no jaws or paired fins
acanthodian
early fish which was the first to have jaws
cartilage
strong lightweight flexible connective tissue
terrestrial
term that describes an organism that is able to live on land
thecodont
crocodilelike reptil from which dinosaurs evolved
Pangea
the single super continent fo the Triassic period that includes all presently known continents
ectothermic
referring to animals whose body temperature is determined by the temperature of their enviroment
endothermic
refers to animals that generate body heat themselves
therapsid
extinct order of reptiles thought to be the endothermic that likely gave rise to mammals
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 cavity where water exits
countercurrent flow
arrangment in fish respiratory system where water going over the gills and blood in the gill filaments flows in opposite directions
nephron
tubelike structures in the kidneys that filters wastes from the body and retains useful molecules
lateral line
specialized sensory system running the length of both sides of a fish's body
operculum
hard plate that covers the gills on each side of the head of bony fishes
swim bladder
the gas-filled sac of bony fishes used to regulate their buoyancy
teleost
group of bony fishes with highly mobile fins, thin scales, a swim bladder, and symmetrical tails; largest group of living fish
lung
internal, baglike respiratory organ of a vertebrate that enables gas exchange between the air and the blood
pulmonary vein
vessel that carries oxygen rich blood from the lungs to the heart
septum
thick wall that divides the heart's atrium or ventricle into riht and left halves