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Frog Dissection

Frog Dissection. The mouth, nostrils, and eyes. 1. Nictictating membrane- Protects eyes (similar to an eyelid) 2. Tympanic membrane – the ear drum Collects sound waves Allows frogs to hear in water. 2. 1. Maxillary Teeth – (along inner edge of upper jaw)

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Frog Dissection

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  1. Frog Dissection

  2. The mouth, nostrils, and eyes • 1. Nictictating membrane- • Protects eyes (similar to an eyelid) • 2.Tympanic membrane – the ear drum • Collects sound waves • Allows frogs to hear in water 2

  3. 1. Maxillary Teeth – (along inner edge of upper jaw) 3. Vomerine Teeth – (roof of mouth) Teeth are used to hold onto caught prey, do not use them to chew, they swallow prey whole!! 6. Opening to Eustachian tubes 2. internal Nares 8 Glottis Examine the Mouth

  4. 10.Internal Nares –internal nostril openings on either side of the vomerine teeth. • 11.Eustachian tube openings –connenct mouth cavity and the tympanic membrane • Help to equalize internal ear pressure • If the frog is male, these are near the openings to the vocal sacs which allow male frogs to make sounds • 50.Vomerine teeth

  5. Internal Structure -Female • 31.Eggs • 32.Oviduct – tubes which carry the eggs after they have been made

  6. 22 – Eggs 18 – Liver – 3 lobed structure that produces bile for lipid digestion and starch Food does not pass through, but blood does Still considered as part of digestive system 9- Stomach 6 – Ventricle of heart 12 – small intestine

  7. The Heart – 3 chambered structure • 34.Conus arteriosus • 35.Atrium • 36.Ventricle

  8. 19 – Pericardium – membrane that surrounds the heart.

  9. Heart – Circulatory System • 1. Ventricle   • 2. Right atrium  • 3. Left atrium  • 4. Sinus venosus • Triangular sac underneath the heart   • Veins from all over the body empty here before going into the right atrium • Part of circulatory system

  10. The Lungs • Lungs • 2 sac like structures on either side of the heart • Collect oxygen from air and transfer it to blood supply • Part of respiratory system

  11. 7- Right Lung and 8 –Left Lung

  12. Digestive system • 16.Small intestine • At lower end of the stomach • Breaks soupy mixture from stomach into usable nutrients using bile from liver and enzymes from the pancreas • 17.Liver - • 18.Large intestine • Collects waste from tissues and wastes that could not be absorbed by the small intestine. • 19.Stomach – secretes digestive juices to break down whole food swallowed by the frog into a soupy mixture

  13. 26.Spleen –filters improperly functioning blood cells; circulatory system • 29.Teste

  14. 10 – pancreasSecretes enzymes into small intestine

  15. 19 – stomach54 - pancreas

  16. Digestive system • 16.Small intestine • 19.Stomach • 33.Gall bladder

  17. 11- Pylorus- muscular valve between the stomach and small intestine

  18. 23 – KidneyLocated in either side of the spine, near the dorsal side; filter blood and urine that drains into the urinary bladder; excretory system

  19. 23 & 24 Kidneys • 21 – Fat Bodies • 27 – Urinary Bladder • urine travels from the kidneys, down tubes called ureters to this bladder where it is stored until emptied through the cloaca.

  20. 21 – Fat Bodies • Attached near kidneys • Store fat for nourishment for the gametes • Much larger and more abundant in females • 22-Testes • Small, oval structure underneath kidneys • Sperm travels through the kidneys, down the ureters and out the cloaca. • 23 & 24 Kidneys

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