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Class Amphibia (Chapter 30.3)

Class Amphibia (Chapter 30.3). Please set up your notebook for Cornell Notes. What is an amphibian? Characteristics Vertebrates, generally live in water as larva and land as an adult Breathes with lungs as an adult and has moist skin. Form and Function Feeding

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Class Amphibia (Chapter 30.3)

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  1. Class Amphibia(Chapter 30.3) Please set up your notebook for Cornell Notes

  2. What is an amphibian? • Characteristics • Vertebrates, generally live in water as larva and land as an adult • Breathes with lungs as an adult and has moist skin

  3. Form and Function • Feeding • Larva  typically filter feeders or herbivores • Adults  carnivorous • Digestive tract  mouth, esophagus, stomach, intestines, cloaca • Cloaca  muscular cavity through which urine, poop, egg and sperm leave the body • Respiration • Larva – most use skin and gills • Adults – gills are replaced with lungs although some gas exchange occurs through skin

  4. Circulation • Double Loop • First loop carries oxygen poor blood from heart to lungs and skin • Second loop carries oxygen rich blood from heart to body and oxygen poor blood from body to heart • Heart – 3 chambers • Right atrium  gets oxygen poor blood from body • Left atrium  gets oxygen rich blood from skin and lungs • Ventricle  gets blood from both atria, then pumps to body • Blood from each ventricle is mixed

  5. Excretion • Amphibians have kidneys to filter waste from blood • Urine is transported from kidneys to cloaca by thin tubes called ureters • Reproduction • Most amphibians have external fertilization • Eggs do not have shells and must be kept moist; laid in or near water • Movement • Larva move like fish • Adults walk, hop, run, or jump

  6. Response • Similar brain to fish • Well developed nervous and sensory systems • Eyes  have protective membrane called nictitating membrane • Tympanic membrane  eardrums, located on side of heads • Have lateral line systems

  7. Orders of Amphibians • Order Caudata (Urodela)  salamanders and newts • Carnivorous both as adults and larva • Adults live in moist places like under logs and rocks • Some salamanders have gills all their life and live in water (mud puppy) • Some salamanders do not have lungs and rely on gas exchange through skin

  8. Order Anura frogs and toads • No tail as adults • Frogs • Leap, have smooth, moist skin • Toads • Hop, have warty, drier skin

  9. Order Apoda – Caecilians • Legless animals that live in water and burrow in moist soil • Many have fish like scales embedded in skin

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