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Frogs

Frogs. Picture source: fcps.edu. This presentation is abridged from alki.vansd.org/dguymon/sp06%20 Frog %20 Dissection . ppt. Scientists believe other vertebrates evolved from BONY LOBE-FINNED fish. Scientific American; Dec 2005; Vol 293; p100-107. AMPHIBIAN CHARACTERISTICS.

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Frogs

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  1. Frogs Picture source: fcps.edu This presentation is abridged from alki.vansd.org/dguymon/sp06%20Frog%20Dissection.ppt

  2. Scientists believe other vertebrates evolved from BONY LOBE-FINNED fish

  3. Scientific American; Dec 2005; Vol 293; p100-107

  4. AMPHIBIAN CHARACTERISTICS Moist, thin skin without scales Aquatic larva changes to terrestrial adult Feet without claws Respiration with gills, lungs, skin, mouth Closed 2 loop circulation Ectothermic (cold blooded) Eggs without shells or multicellular membranes

  5. http://users.erols.com/jkimball.ma.ultranet/BiologyPages/V/Vertebrates.htmlhttp://users.erols.com/jkimball.ma.ultranet/BiologyPages/V/Vertebrates.html http://www.spekulantenguide.de/gifs/salamanderw.jpg

  6. FROG ANIMALIA LATIN meaning KINGDOM _____________ PHYLUM ____________________________ SUBPHYLUM ___________________________ CLASS _______________________________ ORDER _____________________________ CHORDATA VERTEBRATA “backbone” AMPHIBIA “double life” ANURA “without a tail”

  7. ECTOTHERMIC“cold blooded” Body temperature is dependent on surrounding environment http://www.vanscyoc.net/randy/garden/wildlife/image4.htm

  8. HIBERNATION/ ESTIVATION FAT stored in FAT BODIES provides energy Images from: http://www.enc.org/Classroom_Calendar/CC_Units/Unit_Images/185.jpg http://www.reptilis.org/pyxi/image5.htm

  9. Reproduction:AMPLEXUS “firm embrace” Sperm and egg released @ same time and place Increases chances of fertilization

  10. Frog Life Cycle Grow legs; Lose tail 2 chambers  3 chambers 1 loop 2 loops Breathe w/ gills lungs & skin Excrete ammonia excrete urea (gills & kidneys) (kidneys) http://saczoo.com/3_kids/images

  11. How are Tadpoles Similar to Fish? Have a LATERAL LINE system Breathe with gills Excrete nitrogen waste as AMMONIA (with gills & kidneys) Have a 2-chambered heart Have a single-loop circulatory system

  12. Tadpole Respiration:Larvae breathe with GILLS Source: bu.edu

  13. Tadpole Circulatory System

  14. Images from: http://www2.volstate.edu/msd/BIO/1020/Lab7ChordateII.htm TADPOLES & FISH: 2-chambered heart single-loop system ADULT FROG: 3-chambered heart double-loop system

  15. Sinus venosus BODYorgans    Atrium GILLS   Conus arteriosus Ventricle  FISH CIRCULATION

  16. ADULT FROGS Thin, moist skin – no scales Mucous glands make it “slimy” Camouflage- for protection Some have poison glands http://www-binf.bio.uu.nl/dutilh/hall/kikkers.html

  17. Adult Frog Respiratory System

  18. http://www.tvdsb.on.ca/westmin/science/snc2g1/frogresp.htm BREATHING THROUGH SKIN is called CUTANEOUS RESPIRATION

  19. http://www.tvdsb.on.ca/westmin/science/snc2g1/frogresp.htm BREATHING WITH LUNGS is called PULMONARY RESPIRATION

  20. Adult Frog Circulatory System

  21. Sinus venosus    Bodyorgans   RIGHTAtrium LEFTAtrium  Lungs       Conus arteriosus  Ventricle  FROG CIRCULATION

  22. Excretory Systems Removes nitrogen waste made by cells Nitrogen waste has different chemical forms: ___________ __________ _____________ MOST TOXIC made from LEAST TOXIC ammonia by needs the least liver water to dilute FISH HUMANS BIRDS, REPTILES AMPHIBIANS AMMONIA UREA URIC ACID

  23. ALL WASTE is NOT THE SAME! DIGESTIVE waste-left over from undigested foodtravels through digestive system leaves through digestive system as feces EXCRETORY waste- (Also called NITROGEN WASTE)made by cells from break down of proteins travels through blood stream leaves through excretory system as ammonia, urea, or uric acid

  24. Discuss: • Why do frogs need to keep their skins moist? • Why are a frog’s lungs considered small when compared to a human’s lung: body size ratio? • How are frog and tadpole diets different?

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