Class Reptilia

Class Reptilia - Class Reptilia To crawl-turtules, lizards,...

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Class Reptilia To crawl—turtules, lizards, snakes, dinos, Mesozoic Era—age of the reptiles Adaptations to Life on Land Improved respirations, circulation, locomotion, fully terrestrial excretory system and reproductive capabilities Features Epidermis - Body covered by horny epidermal scales formed of folds of dead skin that protect the body against desiccation and physical injury - Scales not always shed, sometimes added to grow - Epidermis—dead cells—scales of lizards and snakes - Dermis—living cells - Ostodem—bone deposit beneath epidermis that form scales—turtles and alligators Body cavity - Coelom divided into: o Pericardial cavity—surrounds heart o Pleural cavity—surrounds lungs o Peritoneal cavity—contains remaining internal organs Alveoli - Alveoli increase the surface area of the lungs and enhance respiration - Amphibians swallow air Angled ribs - Make it possible for air to be drawn into lungs by contractions of intercostals muscles that extend between ribs - Angled when relaxed—smaller chest cavity volume
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Class Reptilia - Class Reptilia To crawl-turtules, lizards,...

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