1. Amphibian Notes Frog Dissection

2. Challenges to living on land
Amphibian - "double" life
Movement to Land
3 major problems
1. Drying Out
2. Less support
3. Temperature Fluctuations

3. Characteristics of Amphibians
Breathing:
Tadpoles vs. Adult
Mucous glands on the skin
Webbed feet
Cold-blooded
Control metabolism
estivation
hibernation

4. Classification of Amphibians
Tailless Amphibians
(Order Anura)
Ex: Frogs, Toads
Visible Tailed Amphibians
(Order Urodela)
Ex: Salamanders, Newts
Legless Amphibians
(Order Apoda)
Ex: Caecilians

5. Frogs: External Structures
Head and Trunk Fused
Skin: smooth, moist; mucous & poison glands, cutaneous respiration
Hind legs
Eyes
Nictitating membrane—3rd clear eyelid
Tympanic membrane

6. Frogs: Internal Mouth Structures
Eustachian Tube
Vocal Sacs
Internal Nares
Tongue
Vomerine teeth
Maxillary teeth
Gullet
Glottis

8. Frog: Digestive System
Stomach
Small Intestine
Large Intestine
Cloaca
Accessory Organs
Liver
Gall Bladder
Spleen
Fat bodies

9. Other Systems of the Frog
Skeletal System
Respiratory System
Tadpoles vs. Frogs
Circulatory System
Three Chambered Heart:
2 atrium
1 ventricle
Nervous System

10. Other Systems of the Frog…
Excretory System
Kidneys
Ureter
Urinary Bladder
Reproductive System
External Fertilization
Testes and Ovaries