Ch. 3 Sec. 1 What is a Vertebrate?

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: birds mammals

endotherm ectotherm

ectotherms endotherms Draw pictures of 3 ectotherms & 3 endotherms. ectotherms endotherms birds mammals reptiles fish amphibians