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17.4 Reptiles


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Class notes for 17.4

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17.4 Reptiles

  1. 1. 17.4 Reptiles<br />Page 357<br />
  2. 2. Reptile Adaptations<br />Body Covering: reduced water loss<br />Eggs: could be laid on land<br />These adaptations appeared 300 million years ago<br />
  3. 3. Reptile Characteristics<br />Dry, waterproof covering made up of scales<br />Conserve water<br />Prevent exchange of oxygen & carbon dioxide<br />Rely on lungs for breathing<br />
  4. 4. Reptile Characteristics<br />Produce eggs covered by a thick, leathery shell<br />Prevents moisture from escaping<br />Keeps sperm from entering<br />
  5. 5. Reptile Characteristics<br />3-Chambered Hearts<br />Partial wall inside main chamber lessons mixing of high and low oxygen blood<br />Results in a heart that works as well as our 4-chambered<br />
  6. 6. Reptile Heart<br />
  7. 7. Human Heart<br />
  8. 8. Reptile Characteristics<br />ECTOTHERMS<br />Good at regulating internal body temperature<br />Bask in sun when air is cool<br />Seek shade when too hot<br />Maintain a steady body temperature<br />
  9. 9. Lizards & Snakes<br />Closely related<br />ALL snakes & MOST lizards are carnivores<br />Both have a special jaw hinge<br />Allows lizards & snakes to swallow their prey whole by increasing the size of their mouths<br />
  10. 10. Snakes<br />Some still have hipbones & remnants of hind legs<br />Sign they evolved from reptiles<br />Poor hearing and eyesight<br />Keen sense of smell & taste<br />
  11. 11. Snake Jaw<br />
  12. 12. Snake Tongue<br />Tongues used to find prey and gather info about environment<br />Tip of tongue picks up chemicals<br />Organ in roof of mouth <br /> identifies & detects odors<br />
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  15. 15. Turtles & Tortoises<br />ALL have shells<br />Little has changed since appearing hundreds of millions of years ago<br />When in danger, most pull in head, legs, and tails under shell<br />
  16. 16. Turtle Shells<br />Form from bony plates connected to their ribs and vertebrae<br />Covered by layer of skin<br />Color patterns and markings<br />
  17. 17. Comparison<br />Turtles<br />Tortoises<br />Flat, streamlined shells <br />Ponds, lakes, rivers, or ocean<br />Must return to land to lay eggs<br />Dome-shaped shells<br />Land animals<br />Remain on land all their lives<br />
  18. 18. Alligators & Crocodiles<br />Closest living relatives to dinosaurs<br />Lizard-like in shape<br />Can grow as long as small boat<br />Backs have large, deep scales<br />
  19. 19. Comparison<br />Alligators<br />Crocodiles<br />Broad head, rounded snout<br />Live mostly in North America & Asia<br />Care for their young<br />Female protects eggs<br />After hatching, male and female protect babies<br />Narrow head, triangular-shaped snout<br />Live in tropical America, Africa, Asia, & Australia<br />