Name ______Date ______Period ______
Frog Dissection
External Anatomy and Oral Cavity:
1.)Record the length of your frog in the box found above.
2.)Describe the coloration of your frog. Compare the colors of the dorsal and ventral surfaces of the frog. Of what adaptive value to the frog is each of these colorations?
3.)The body of a frog is divided into two regions: the ______and the ______. Label on external diagram.
4.)Describe the texture of your frog by answering the questions in your lab packet.
5.)What is the function of the nictitating membrane? How would you describe the texture and color of the nictitating membrane? Label on external diagram.
6.)The tympanic membrane function as which structure?How is this accomplished? Label on external diagram.
7.)The forelimbs have ______digits. The hindlimbs have ______digits. By observing the thumbs, I have determined that my frog is a ( male / female ). What is amplexus?
8.)Perform on frog.
9.)______teeth are found around
the edge of the upper jaw. Label on oral cavity diagram.
10.)Label on oral cavity diagram.
11.)The eustachian tubes lead to the ______. Label on oral cavity diagram.
12.)What is the function of the vocal sacs in male frogs? If applicable,label on oral cavity diagram.
13.) Where is the tongue attached in the mouth of your frog? Why is this beneficial? Label on oral cavity diagram.
14.)Describe the feeling of the maxillary teeth and the vomerine teeth. What is the function of the vomerine teeth? Label on oral cavity diagram.
Internal Anatomy:
15.)Perform on frog. Why should you make shallow cuts through the skin and body wall muscles of your frog?
16.)Perform on frog.
17.)What is the function of the pyloric valve? Label on internal diagram.
18.)Were you able to find any food contents within your stomach? The folds found in the stomach are known as ______. What is their function?
19.) Label on internal diagram.What is the purpose of the folded villi found within the lining of the small intestine?
20.)The colon, or large intestine, ends in the rectum which in turn opens to the ______. Label on internal diagram.
21.)What are the functions of the liver (there is more than one!)? The liver of a frog is made up of ______lobes. The ______stores bile which is secreted by the liver. Label on internal diagram.
22.) What is the function of the pancreas? Label on internal diagram.
23.) Label on internal diagram.Sequence the passage of air into and out of a frog.
24.)The heart of a frog has three chambers: one ______and two ______. Label on internal diagram.
25.)Perform on frog. What is the function of the spleen?Label on internal diagram.
26.)How do wastes travel from the blood to the external environment?Label on internal diagram.
27.)Label on internal diagram.
28.)What is the function of the fat bodies attached near the kidneys? Are the fat bodies larger in male or female frogs (you may need to observe multiple frogs)? Why is this so?