Amphibians
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Amphibians. 7th Grade Life science. Amphibian Characteristics. From greek amphibios = double life Ectotherms -- Hibernation & Estivation Moist smooth skin 3 chambered heart as adults. Animal kingdom. Chordate Phylum. Subphylum Vertebrata. Class Amphibians. Order = Caecillians.

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Amphibians

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Amphibians

7th Grade Life science


Amphibian Characteristics

  • From greek amphibios = double life

  • Ectotherms --Hibernation & Estivation

  • Moist smooth skin

  • 3 chambered heart as adults


Animal kingdom

Chordate Phylum

Subphylum

Vertebrata

Class

Amphibians

Order = Caecillians

Order = Anura

Frogs and Toads

Order = Caudata

(salamanders)


Caecillians


Salamanders


Frogs and Toads


Frog Life Cycle

Metamorphosis

Meta = change / Morph = shape


Frogs

Highly permeable skin that generally needs to stay very moist.

Toads

Have thicker skin and are better adapted to life away from water.

Differences between Frogs and Toads


American Toad


Frog Skeleton


Frog Anatomy

Nictitating

Membrane

Tympanic

Membrane

Dark Camouflaged Back


External Anatomy

  • Nictitating membrane--clear eyelid

  • Tympanic Membrane-- separates the outer environment from the inner ear.

  • Dark camouflage coloration


Mouth Anatomy

Maxillary Teeth

Tongue

Gullet

Mandible


Digestive Tract

  • Mouth --> Pharynx --> Stomach --> Small Intestine --> Large Intestine --Cloaca

  • Small Intestine--nutrient absorption and digestion

  • Large Intestine--digests bacteria, reabsorbs water and forms feces

  • Liver--produces bile for digestion

  • Gall Bladder--stores liver bile


Ventral Anatomy

Liver

Small

Intestine

Gall Bladder


Frog Stomach


Ventral Frog View

Fat Bodies

Small

Intestine

Liver


Frog Dorsal Cut


Circulatory System

  • 3 chambered heart (left/right atrium; ventricle)

  • Veins = Oxygen poor blood

    Artery = Oxygen rich blood

Right Atrium

Ventricle

Left Atrium


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