Warm-Up On your desk is a KWL, in the first column write all the things you know about vertebrates. Once you are finished we will go over them and as we do, put items into the second column that you’d like to learn about. When we are finished today, you will put items into the third column that you learned.
Chapter 11:Fishes, Amphibians, and Reptiles SECTION 1: WHAT IS A VERTEBRATE?
Key Concepts What characteristics do chordates share? What characteristic do all vertebrates have? How do vertebrates differ in the way they control body temperature?
All members of thesubgroup in thephylum Chordataare calledChordates. At some point, achordate will have anotochord, a nervecord that runs downtheir back, and slitsin their throat area.Most chordates arevertebrates, but notall.The five vertebrate Characteristics of Chordatesgroups arefish, amphibians, reptiles, birds, andmammals.
A notochord isthe flexible rod thatsupports achordates back.Chordata alsohave a nerve cord intheir back whichsends messagesfrom their brain totheir nerves.Chordates alsohave slits in theirthroat area. Not all Characteristics of Chordateskeep them for theirentire life.
Characteristics of Chordates What are the five vertebrate groups? Why is it important for the notochord to be both firm and flexible?
Most chordatesare vertebrates.This means thereare othercharacteristics thatthey have then.Vertebrates havebackbones which ispart of theirinternal skeleton.This skeletonsupports the bodyand allows it tomove. Characteristics of Vertebrates
A vertebrae’sbackbone is alsocalled a spine, andit runs down thecenter of its back.Vertebra are thebones that are linedup in a row downthe vertebrae’sback. The jointsbetween thevertebra give it theability to move. Characteristics of Vertebrates
Vertebrates, likehumans, have aninternal skeletonthat protects itsinternal organs.An internalskeleton helps givea vertebrates bodyshape and givesmuscles a place toattach.A vertebrate’sendoskeleton doesnot need to bereplaced, instead it Characteristics of Vertebratesgrows with thevertebrate.
The bodytemperature ofmostfishes, amphibians,and reptiles is closeto the temperatureof theirenvironment.Birds andmammals are theopposite; they havea stable bodytemperature that isusually warmer Keeping Conditions Stablethan theirenvironment.
Fishes, reptiles, and amphibians areectotherms.An ectotherm isan animal whosebody does notproduce muchinternal heat.This means thatan ectothermdepends on itsenvironment forwarmth.Ectotherms are Keeping Conditions Stableoften called cold-blooded.
An endotherm isan animal thatregulates its ownbody temperature bycontrolling theinternal heat itproduces.Its body heat doesnot change mucheven when theenvironmenttemperature does.Endotherms haveadaptations likesweat glands, fur, or Keeping Conditions Stablefeathers to maintaintheir bodytemperature.