1. Amphibians
7th Grade Life science

2. Amphibian Characteristics
From greek amphibios = double life
Ectotherms --Hibernation & Estivation
Moist smooth skin
3 chambered heart as adults

3. Animal kingdom Chordate Phylum Subphylum Vertebrata Class Amphibians
Order = Caecillians
Order = Anura
Frogs and Toads
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Order = Caudata
(salamanders)

4. Caecillians

5. Salamanders

6. Frogs and Toads

7. Frog Life Cycle
Metamorphosis
Meta = change / Morph = shape

8. Differences between Frogs and Toads
Highly permeable skin that generally needs to stay very moist.
Toads
Have thicker skin and are better adapted to life away from water.

9. American Toad

10. Frog Skeleton

11. Frog Anatomy Nictitating Membrane Tympanic Membrane
Dark Camouflaged Back

12. External Anatomy Nictitating membrane--clear eyelid
Tympanic Membrane-- separates the outer environment from the inner ear.
Dark camouflage coloration

13. Mouth Anatomy
Maxillary Teeth
Tongue
Gullet
Mandible

14. 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

15. Ventral Anatomy
Liver
Small
Intestine
Gall Bladder

16. Frog Stomach

17. Ventral Frog View
Fat Bodies
Small
Intestine
Liver

18. Frog Dorsal Cut

19. Circulatory System 3 chambered heart (left/right atrium; ventricle)
Veins = Oxygen poor blood
Artery = Oxygen rich blood
Right Atrium
Ventricle
Remind learners to make notes of this slide
Left Atrium