17.4 Reptiles
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17.4 Reptiles

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17.4 Reptiles 17.4 Reptiles Presentation Transcript

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