Frog Dissection.

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Presentation transcript:

Frog Dissection

I Purpose: To observe the external and internal structures of frog anatomy. How is a frog adapted for surviving in an aquatic and terrestrial environment?

II Materials: Safety goggles, frog, dissecting tray, scissors, dissecting needle

III Procedure: 1. Put on safety goggles 2. Place frog on dissection tray dorsal side up 3. Locate the forelegs and hind legs 4. Locate eyes, mouth, external nares, tympanic membrane and nictitating membranes 5. Hold frog firmly and make a small cut at each of the hinged points of the jaw 6. Locate the gullet

III Procedure: 7. Place frog on ventral surface up, remove the skin from the abdomen. 8. Separate skin from the muscles 9. Remove the muscle without damaging the internal organs 10. Locate the lungs and heart 11. Locate the liver 12. Locate the gallbladder, then remove it

III Procedure: 13. Locate the esophagus which will lead to the stomach. Locate the small intestine from the stomach. 14. Remove the digestive system 15. Locate the two kidneys located on the dorsal, posterior wall 16. Locate the heart, open the pericardium(thin membrane) and the atria and ventricle.

IV Data/Observations: Label 1. Liver 9. cloaca 2. gall bladder 10. spleen 3. esophagus 11. kidneys 4. stomach 12. fat bodies 5. pylorus 13. lungs 6. small intestine 14. heart label ventricle, left atrium, right atrium 7. pancreas 8. large intestine

V Results/Calculations: Not in this lab

VI Questions: 1. How is the coloration of a frog an adaptation to life on land as well as in the water? 2. How are the frog’s feet adapted for swimming? 3. What is important about the location of the frog’s eyes and nostrils if the animal is floating in the water? 4. Where is the tongue attached to the mouth? Why is this an important adaptation

VI Questions: 5. What is the function of the vomerine teeth? 6. Describe what happens to the lungs when air is pumped in. 7. How many lobes does the liver contain? 8. What is the function of the gall bladder? 9. Describe the general shape, or plan, of the frog’s digestive system. 10. Explain why the ventricle in the frog’s heart has a thicker wall than the atrium.

VII Discussion: Discuss what would be the next lab to follow this dissection.

VIII Conclusion: (Answer the purpose)