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Chordates & Fish

A section in the Vertebrate Study Guide

What 3 characteristics are all shared by chordates at some point in their life? Notochord; Nerve cord; Gill slits
What does the nerve cord end up developing into? Brain
What is the controversy with gill slits? What is the alternate name for them now? Great controversy that humans/mammals don’t actually have “gills” but pharyngeal clefts that develop into something else; pharyngeal slits.
What type of skeleton do vertebrates have? endoskeleton
What is the purpose of the skeleton? support & protect the internal organs
What are ectotherms? What is another name for ectotherms? body temperature changes as surroundings change; cold-blooded animals
What are endotherms? What is another name for endotherms? body temperature doesn’t change as surroundings do; warm-blooded animals
What is the largest group of vertebrates? fish
What are gills? fleshy filaments where CO2and oxygen are exchanged.
What are the 3 types of fish? Give an example of each. Bony fish-goldfish; jawless fish-lamprey; cartilaginous fish-shark
What is cartilage? tough, flexible tissue similar to bone but not as hard or brittle.
What is the swim bladder? air sac that helps control the depth at which the fish swims
What happens as gases move in and out of the swim bladder? Deflates & inflates as gases move between the swim bladder & blood. Fills with glassfish rises and vice versa
What is the purpose for fins? Steering the fish
What do jawless fish have? scale-less, long, tube-like bodies; Round, muscular mouth without a jaw
What are the cartilaginous fish made of? cartilage
What are most cartilaginous fish? predators
Created by: GwendolynetheOC