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NAME: _____________________
BLOCK: _______
THE FROG AS A VERTEBRATE AND AN AMPHIBIAN
Objectives:
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To observe the external anatomy of a frog
To compare a vertebrate with invertebrates
To compare an amphibian with other vertebrates
To study the organ systems of a frog
To observe the relationship between the structure and function of organs
Materials:
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Procedure: Refer to pages 183-184 of the Biology Laboratory Manual. Read and follow each
procedure step. Record your answers to the questions on this paper.
Observations:
1. a. ____________________________________________
b. ____________________________________________
2. a. ____________________________________________
b. ____________________________________________
3. a. ____________________________________________
b. ____________________, ______________________, _____________________
c. ____________________________________________
4. a. ___________________________________________
b. ___________________________________________
c. ___________________________________________
5. a. What is unusual about the attachment of the tongue?
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b. What is the advantage of this attachment?
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c. What might be the function of the vomerine teeth?
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d. Which jaw has tiny maxillary teeth around the rim of the mouth?
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THE INTERNAL ANATOMY OF THE FROG
Procedure: Refer to pages 185-186 of the Biology Laboratory Manual. Follow procedure
steps 1-11 and record your answers in the space below.
Observations:
6. Label Figure 1. Digestive system.
7. a. Examine the inner lining of the small intestine. What do you see?
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b. What might be their function?
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8. Label Figure 2. Reproductive and Excretory system.
Female
9. Label Figure 3. The Circulatory System
Male
Discussion Questions:
1. How are the relative lengths of the frog’s small intestine and large intestine related
to their functions?
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2. Which three body systems does the cloaca belong to, and what is the function of
each?
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3. How is the frog’s heart different from the heart of a fish?
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4. The ventricle has thicker, more muscular walls than the atria. Relate this difference
in wall structure to the functions of the two types of heart chambers.
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