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Chordate Vocab

Have fun studying that rather small vocab list thats on the science study guide. :(

Terms

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copy deck
monotremes
mammals that lay eggs; the duck billed platypus
swim bladder
an air sack that allows boyancy
fins
fanlike structures in fish used for steering and balancing
"amphibian" (meaning)
"double life"
placenta
saclike organ in which a placental embryo develops
biological indicator
species whose overall health reflectrs on the health of the environment
lateral line system
sensory system for detecting movement in water, first seen in cartaliginous fish.
amniotic egg
provides a complete environment for embryo develpment
scales
hard, thin plates that cover the skin and protect the body
crocodile
narrow head, traingular snout
operculum
the covering over gill slits in bony fish
ectotherm
cold-blooded
umbilical cord
connects the embryo to the placenta
fish
animals with fins, scales, and gills
alligator
broad head, rounded snout
notochord
firm but flexable cord that supports the body
vertebrate
organism with a backbone
chordate
organism with notochord, postanal tail, nerve cord, and dorsal gill slits
marsupials
mammals with an external pouch; kangaroo
placentals
offspring who develop inside placenta; humans
gestation period
the period of development from fertalization to birth
hibernation
a period of inactivity in cold weather
estrivation
a period of inactivity in hot/dry weather
endotherm
warm-blooded
cartilage
tough, flexable tissue
the four hallmarks of all chordates
notochord, postanal tail, dorsal nerve cord, gill slits
endoskeleton
an enternal framework made up of bone and cartilage
preening
process in which birds rub oil from oil glands over it's feathers to condition and waterproof them

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