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Biology CH. 25

Vertebrate Diversity

Chordate Any animal having, at some stage in development, a hollow nerve cord, pharyngeal slits, and tail.
Notochord Flexible skeletal support rod embedded in an animal's back.
Endoskeleton Internal skeleton built of bone or cartilage.
Gill Respiratory organ of aquatic animals that allows breathing underwater.
Countercurrent Flow Flow of water opposite that of the flow of blood in a fish's gills.
Lateral Line Sensory system in fish that allows them to sense distant movements in the water.
Operculum Protective bony plate that covers a fish's gills.
Ray-Fin Fan shaped arrangement of bones in a fish's fin.
Swim Bladder Buoyancy organ that helps fish to swim at different depths in the water.
Lobe-Fin Paired limblike fin that is round in shape.
Tetrapod Vertebrate with four limbs.
Amphibian Vertebrate that can live on land and in water.
Tadpole Aquatic larva of frogs or toads.
Amniote Vertebrate whose embryo or fetus is enclosed by a thin, tough membranous sac.
Keratin Protein that binds to lipids inside a skin cell, forming a waterproof layer within the skin.
Amniotic Egg Waterproof container that allows an embryo to develop out of water and externally from the mother without drying out.
Placenta Organ that develops in female mammals during pregnancy and carries nutrients from the mother to the embryo.
Created by: Mr.Devine



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