Transcript Frog Dissection

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