White Rat Dissection - Internal

Name: _________________________________________Date:______________ Period___________

1. Before you begin make sure that the animal is tied down as the teacher instructed.

Using the instructions, found on page 37 of the package, read steps 1 to 6 BEFORE you make any incision. The diagrams found on pages 36 and 37 will show you were to make your cuts.

2. How do the muscles on the stomach compare to those of on the legs?

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DIGESTIVE SYSTEM

3. To open the abdominal cavity (Stomach Area) look at the instructions found on page 79 under the title "The Dissection" this will explain how to cut open the abdominal cavity. Scissors are the best tool to use for this. You will also find the picture on page 85 in the package also very helpful. BE CAREFUL NOT TO CUT TO DEEP AND INJURE THE ORGANS BELOW.

Using pages 79 through 88 to answer the following questions.

  1. What is the largest organ that you first see?__________________

5. What is the size (length and width) of this large organ? length ______________ width ___________

6. How many lobes does the liver have? ______________________

  1. Locate the following organs and explain its function.

    2. Stomach_________________________________________________________________________

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    Large intestine______________________________________________________________________

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    Small intestine _____________________________________________________________________

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    Spleen _________________________________________________________________________

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    Pancreas _________________________________________________________________________

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    RESPIRATORY SYSTEM

  2. Read the instructions found on page 91 of the package under the title "The Dissection"
  3. Once you have cut open the chest cavity ( Thoracic Cavity) locate the following organs and tell what they look like.

    4. Right lung _________________________________________________________________

    Left lung_________________________________________________________________

    Top of the heart_________________________________________________________________

    Trachea _________________________________________________________________

    Optional 10. If you have the time, cut open one of the lungs and see what it looks like.

     

    CIRCULATORY SYSTEM

  4. Remove the lungs to expose the heart.
  5. What is the size of the heart? ___________
  6. How does it compare to the heart of a……
      1. a fish ____________________________________________________________
      2. a frog_____________________________________________________________
      3. a human___________________________________________________________

Optional-------13. Cut open the heart and describe what the chambers look like._________________________________

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  1. What is the function of each of the heart chambers?

    2. Right atrium _____________________________________________________________

    Left atrium ______________________________________________________________

    Right ventricle____________________________________________________________

    Left ventricle ____________________________________________________________

    NERVOUS SYSTEM

  2. Have the teacher assist you in located and exposing the brain.
  3. Locate and describe the size of the brain ( page 144 in the package will help you with this) _________________________________________________________________
  4. How does the brain of the rat compare to that of human's?

    5. ______________________________________________________________________________________

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  5. Explain what part of the brain controls the following parts of the body
    1. the muscles of the eye ________________________________________________________
    2. tongue muscles _____________________________________________________________
    3. heart and stomach ___________________________________________________________
    4. skin _________________________________________________________________

Optional Dissections

18. Locate the Kidneys and describe ______________________________________________________________________________________

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19. Remove the eye and describe how the eye lens compares to that of the Use page 138 & 139 in the package to help you with the answer

Frog _________________________________________________________________

Human _________________________________________________________________

 

 

  1. Locate and describe the saliva glands (page 83 in the package will help identify the organs)

    2. __________________________________________________________________________________

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  2. Cut open the mouth to expose the back of the throat. Use page 84 as a guide to what you should see.

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  3. How far back does the tongue go in the mouth? Use page 84 as a guide to what you should see

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  4. The two openings at the back of the throat are for the lungs and stomach.
  5. What are their names and which one is closer to the front of the mouth?

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  6. How are the teeth on the top like/different from the teeth on the bottom? Use page 27 & 29 as a guide to what you should see.