1. AMPHIBIANS Dr. Tyrone

2. newt
salamander
Legless amphibians
Toads/frogs
CAECILIANS

4. E. METAMORPHOSIS FROM LARVA TO ADULT
AMPHIBIANS ARE THE ONLY VERTEBRATES WITH A LIFE CYCLE THAT INCLUDES METAMORPHOSIS
TRIGGERED BY HORMONE THYROXINE
DURING META. A DOUBLE LOOP, 3 CHAMBERED HEART, REPLACES A SINGLE LOOP, 2 CHAMBERED ONE

5. METAMORPHOSIS TEACHER’S DOMAIN ANIMAL METAMORPHOSIS

6. A. MOVEMENT & SUPPORT
ADAPTATION FROM WATER TO LAND IS STILL EVIDENT IN AMPHIBIANS
Webbed Feet/sticky pads
Ears behind eyes –tympanic membrane
Moist skin
Exchange CO2/O2 through skin

7. A. MOVEMENT & SUPPORT LEGS:
LIMBS EXTEND OUTWARD TO LIFT THE BODY OFF THE GROUND
LIMBS ALLOW THEM TO LEAP
WALK SIDE TO SIDE, SIMILAR TO HOW FISH SWIM SIDE TO SIDE
FEET:
WEBBED FOR SWIMMING Video

8. B. RESPIRATION Amphibians
LAND
Skin is moist to diffuse CO2 for O2 through cell membrane
Also use lungs also for gas exchange
lungs stay moist because they are double membrane filled w/fluid. Like humans
WATER
use gills either at larval stage (tadpole) or as an adult.

9. Anatomic features for GAS EXCHANGE
B. RESPIRATION
Anatomic features for GAS EXCHANGE
1. GILLS
2. SKIN
3. LUNGS
4. MOUTH
MUCUS GLANDS keep skin, & respiratory system moist

11. C. CIRCULATION In larval stage tadpoles have a double chambered heart
1 atria
1 ventricle
Closed circulatory system
Mixing of 02 rich/poor blood
Single loop

12. CIRCULATION http://www.pbs.org/wgbh/nova/sciencenow/3209/05.html
Adult frogs develop a 3 chambered heart
2 atria
1 ventricle
Closed circulatory system
Separation of 02 rich/poor blood
2 loop

13. DIGESTION http://video. nationalgeographic
MOST EAT INSECTS
LARVAL STAGES EAT ALGAE
SYSTEM BEGINS AT MOUTH, ENDS AT CLOACA

14. D. FROG DIGESTIVE SYSTEM
CLOACA

15. F. REPRODUCTION NG Video Mud puddle Frog Video
FEMALES USUALLY LAY EGGS IN H2O OR ON A PLANT, NEAR WATER
THE MALE FERTILIZES THE EGGS WITH SPERM
GELLY-TYPE COATING OR FOAM PROTECTS THE EGGS FROM DRYING OUT.

16. FROG’S EXTERNAL ANATOMY6
WEB FOOT
NARES
HIND LEGS
EAR (TYMPANIC MEMB)
DORSAL AREA
FORELIMB
VENTRAL AREA
MOUTH
LOWER LID
UPPER LID 2 9 11
McGraw Hill virtual lab 10 1

17. Mouth

21. Left Atrium

22. Fat body
oviduct
Fat body
Kidney
Testes
Kidney
ureter
Cloaca
Egg Sac
Cloaca
Bladder
Bladder