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What is a Vertebrate?

What is a Vertebrate?. Warm-Up: Key Terms. Define the key terms on p. 456 Chordate Notochord Vertebra Ectotherm Endotherm. Characteristics of Chordates. Notochord Nerve cord in back Slits in throat area. Characteristics of Vertebrates. Vertebrae Spinal cord

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What is a Vertebrate?

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  1. What is a Vertebrate?

  2. Warm-Up: Key Terms • Define the key terms on p. 456 • Chordate • Notochord • Vertebra • Ectotherm • Endotherm

  3. Characteristics of Chordates • Notochord • Nerve cord in back • Slits in throat area

  4. Characteristics of Vertebrates • Vertebrae • Spinal cord • Internal skeleton called an endoskeleton • Backbone • Skull • Ribs • limbs

  5. Checking for Understanding • Look at Figure 3 on page 458 to answer the following questions: • From head to tail, what benefits does the endoskeleton offer? • How does an endoskeleton differ from an arthropod exoskeleton?

  6. Answer: Checking for Understanding • From head to tail, what benefits does the endoskeleton offer? • Skull protects brain; ribs protect heart, lungs and other organs; muscles attach to bones; arm and legs bones adapted for movement; whole skeleton gives body shape • How does an endoskeleton differ from an arthropod exoskeleton? • Provides internal support and grows as the animal grows

  7. Evolution of Vertebrates • Vertebrates probably evolved from an invertebrate chordate ancestor. • Evidence for this is obtained from fossils and DNA.

  8. Evolution of Vertebrates

  9. Keeping Conditions Stable • Body temperature: • Fishes, amphibians, and reptiles  close to their environment • Birds and mammals  warmer than their environment

  10. Ectotherm • Fishes, amphibians, and reptiles • Often called “coldblooded”

  11. Endotherm • Birds and mammals • Body temperature does not change much • Adaptations: • Fur or feathers • Sweat glands • Can live in a greater variety of environments than ectotherms can.

  12. Checking for Understanding • On a cool, sunny morning, a Woma python raises its body temperature by bathing in the sun. In contrast, an emperor penguin stays warm by producing internal heat. Which animal is an endotherm?

  13. Answer: Checking for Understanding • On a cool, sunny morning, a Woma python raises its body temperature by bathing in the sun. In contrast, an emperor penguin stays warm by producing internal heat. Which animal is an endotherm? • THE PENGUIN

  14. Assignment • Section 1 Assessment • Page 460, #’s 1-3 • Do Cornell-Notes Style

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