ch. 3 sec. 1 what is a vertebrate?. characteristics of phylum chordata notochord nerve cord...
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Ch. 3 Sec. 1 What is a Vertebrate?
characteristics ofphylum Chordata
notochord
nerve cord
pharyngeal slits
• There are a few invertebrates that are chordates (they have a notochord)
• But most chordates are vertebrates, and their notochord is replaced by a backbone as they develop.
Similarities in vertebrate development
functions of endoskeleton
(internal skeleton)1. supports & protects body
2. gives body shape
3. gives muscles place to attach
A vertebrate’s backbone is part of an endoskeleton, or internal skeleton.
endoskeleton
Snake skeleton
Turtle skeleton
The backbone
• The backbone is not just one huge bone!
• It is formed by many VERTEBRAE (singular vertebra)
• There is a hole through each vertebra to allow the nerve cord to pass through it
ectotherm• animal whose body temp. does not
produce much internal heat• body temp. changes depending on temp.
of environment• “cold-blooded”• examples:
– fishes–amphibians– reptiles
endotherm• animal whose body controls &
regulates its temp. by controlling internal heat it produces
• body temp. does not change much with environment
• “warm-blooded”• examples:1. birds2. mammals
ectotherm
endotherm
ectotherms endotherms
reptiles
fish
amphibians
birds
mammals
Draw pictures of 3 ectotherms & 3 endotherms.
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