Frogs Picture source fcps edu This presentation is
- Slides: 25
Frogs Picture source: fcps. edu This presentation is abridged from alki. vansd. org/dguymon/sp 06%20 Frog%20 Dissection. ppt
Scientists believe other vertebrates evolved from BONY LOBE-FINNED fish
Scientific American; Dec 2005; Vol 293; p 100 -107
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
http: //users. erols. com/jkimball. ma. ultranet/Biology. Pages/V/Vertebrates. html http: //www. spekulantenguide. de/gifs/salamanderw. jpg
FROG LATIN meaning ANIMALIA KINGDOM _______ PHYLUM ______________ CHORDATA VERTEBRATA “backbone” SUBPHYLUM ______________ AMPHIBIA “double life” CLASS ________________ ANURA “without a tail” ORDER _______________
ECTOTHERMIC “cold blooded” Body temperature is dependent on surrounding environment http: //www. vanscyoc. net/randy/garden/wildlife/image 4. htm
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/image 5. htm
Reproduction: AMPLEXUS “firm embrace” Sperm and egg released @ same time and place Increases chances of fertilization
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
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
Tadpole Respiration: Larvae breathe with GILLS Source: bu. edu
Tadpole Circulatory System
Images from: http: //www 2. volstate. edu/msd/BIO/1020/Lab 7 Chordate. II. htm TADPOLES & FISH: 2 -chambered heart single-loop system ADULT FROG: 3 -chambered heart double-loop system
Sinus venosus Atrium BODY organs GILLS Ventricle Conus arteriosus FISH CIRCULATION
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
Adult Frog Respiratory System
http: //www. tvdsb. on. ca/westmin/science/snc 2 g 1/frogresp. htm BREATHING THROUGH SKIN is called CUTANEOUS RESPIRATION
http: //www. tvdsb. on. ca/westmin/science/snc 2 g 1/frogresp. htm BREATHING WITH LUNGS is called PULMONARY RESPIRATION
Adult Frog Circulatory System
Sinus venosus RIGHT LEFT Lungs Atrium Ventricle Body organs Conus arteriosus FROG CIRCULATION
Excretory Systems Removes nitrogen waste made by cells Nitrogen waste has different chemical forms: AMMONIA ______ UREA _____ URIC ACID _______ MOST TOXIC made from ammonia by liver HUMANS AMPHIBIANS LEAST TOXIC needs the least water to dilute BIRDS, REPTILES FISH
ALL WASTE is NOT THE SAME! DIGESTIVE wasteleft over from undigested food travels 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
Discuss: 1) Why do frogs need to keep their skins moist? 2) Why are a frog’s lungs considered small when compared to a human’s lung: body size ratio? 3) How are frog and tadpole diets different?
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